[177]*177LINDE, J.
In May 1983 the City of Portland brought consolidated actions to enjoin, as a “public nuisance,” defendants’ operation of so-called “adult bookstores” at locations where a city ordinance bans “adult bookstores” as defined in the ordinance. Each defendant asserted that the ordinance is an invalid restraint on free expression under Article I, section 8, of the Oregon Constitution. The circuit court agreed and entered judgment for defendants in November 1984, and the city appealed. In September 1987 the Court of Appeals, being evenly divided, affirmed the circuit court’s decision without opinion, City of Portland v. Tidyman, 87 Or App 488, 742 P2d 1202 (1987), and we allowed the city’s petition for review. For the reasons that follow, we affirm the judgment of the circuit court.
I. THE PORTLAND ORDINANCE
The ordinance at issue undertakes to deal with “adult businesses” by requiring them to locate at least 500 feet distant from any residential zone or any public or private school and, in some zones, at least 1000 feet from any other adult business. “Adult” in contemporary society and commerce (not to say culture) has come to be equated specifically with sexual conduct and erotic entertainment, and the ordinance includes “adult bookstores” among other “adult businesses” such as theaters, “adult arcades,” cabarets, “adult paraphernalia shops,” and “relaxation treatment” enterprises that are characterized by an emphasis on nudity or sexual activity. Portland Ordinance No. 155387, Portland Municipal Code § 33.80.030.1 The city adopted its cordon sanitaire approach to [178]*178the sex business in 1983 from a Detroit ordinance that had survived a First Amendment challenge in the United States Supreme Court, although without a majority opinion. Young v. American Mini Theatres, 427 US 50, 96 S Ct 2440, 49 L Ed 2d 310 (1976).
Meanwhile, however, this court in State v. Spencer, 289 Or 225, 611 P2d 1147 (1980), and State v. Robertson, 293 Or 402, 649 P2d 569 (1982), spelled out an independent analysis under Article I, section 8, Oregon’s guarantee of free expression. Article I, section 8, provides:
[179]*179“No law shall be passed restraining the free expression of opinion, or restricting the right to speak, write, or print freely on any subject whatever; but every person shall be responsible for the abuse of this right.”
Spencer and Robertson and their sequels2 emphasized that the clause is addressed to lawmakers at the time they consider making a law and forbids the enactment of a law directed in terms against any subject of speech, writing, or printing that cannot be shown to fall within an old or modern version of a well-established historical exception that the constitutional guarantees demonstrably were not meant to displace. This analysis was argued before the circuit court and on appeal. In 1987, while the Court of Appeals was considering the appeal, this court, finding no such well-established and demonstrably preserved historical exception for “obscenity,” invalidated laws against disseminating obscene material and against telephonic harassment that were written in terms describing the forbidden content of speech or printed material. State v. Henry, 302 Or 510, 732 P2d 9 (1987); State v. Ray, 302 Or 595, 733 P2d 28 (1987).
Henry and Ray were criminal prosecutions, and the court noted that they did not involve other forms of regulation:
“We do not hold that this form of expression, like others, may not be regulated in the interests of unwilling viewers, captive audiences, minors and beleaguered neighbors. No such issue is before us. But it may not be punished in the interest of a uniform vision on how human sexuality should be regarded or portrayed. We also do not rule out * * * reasonable time, place and manner regulations of the nuisance aspect of such material or laws to protect the unwilling viewer or children. Again, no such issue is before us. However, no law can prohibit or censor the communication itself. In this state any person can write, print, read, say, show or sell anything to a consenting adult even though that expression may be generally or universally considered ‘obscene.’ ”
State v. Henry, 302 Or at 525. See also State v. Ray, 302 Or at 602 (Linde, J., concurring) (laws might provide a compensatory rather than prohibitory remedy for injuries to “person, [180]*180property, or reputation,”3 by “abuse” of rights under Article I, section 8.) The city defends its ordinance as the kind of reasonable regulation of the “nuisance aspect” of sexually explicit material in the interests of “minors and beleaguered neighbors” left open in the quoted paragraph.
II. AUTHORITY AND COVERAGE
The city’s briefs below and in this court commendably deal with subconstitutional points of city authority and the text of the ordinance before addressing its constitutionality. See e.g., DeFazio v. WPPSS, 296 Or 550, 555, 679 P2d 1316 (1984); Planned Parenthood Assn. v. Dept. of Human Res., 297 Or 562, 564, 687 P2d 785 (1984); Carson, “Last Things Last”: A Methodological Approach to Legal Argument in State Court, 19 Willamette L Rev 641 (1983).
As to its authority, the city cites a provision of its charter that empowers the city to regulate the “use and management of buildings,” Portland City Charter § 2-105(a)(35). This charter authority concerns the physical use, maintenance and management of buildings for various purposes, including merchandising, but not the selective regulation of the kind of printed materials sold by a bookstore. But the next paragraph provides authority
“to regulate, restrain and to provide for the exclusion from the city, or any part thereof, of trades, occupations or businesses which are offensive or may in the opinion of the Council create or constitute a nuisance, and to regulate uses of land and structures within the city.”
Portland City Charter § 2-105(a)(36). To construe this paragraph as insufficient to authorize the ordinance before us would unjustifiably narrow the city’s powers under its charter. Cf. DeFazio v. WPPSS, supra, 296 Or at 569-70. The charter provides ample authority for Ordinance No. 155387, subject to constitutional limitations.
As to the text, the ordinance restricting the location of “adult businesses” defines an “adult bookstore” to be
[181]*181“an establishment having, as substantial or significant portions of its merchandise, items such as books, magazines, other publications, films, video tapes, or video disks which are for sale, rent, or viewing on premises and which are distinguished by their emphasis on matters depicting specified sexual activities * * * and/or nudity [as defined elsewhere in the city code.]”
Portland City Code § 33.80.030(A).
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[177]*177LINDE, J.
In May 1983 the City of Portland brought consolidated actions to enjoin, as a “public nuisance,” defendants’ operation of so-called “adult bookstores” at locations where a city ordinance bans “adult bookstores” as defined in the ordinance. Each defendant asserted that the ordinance is an invalid restraint on free expression under Article I, section 8, of the Oregon Constitution. The circuit court agreed and entered judgment for defendants in November 1984, and the city appealed. In September 1987 the Court of Appeals, being evenly divided, affirmed the circuit court’s decision without opinion, City of Portland v. Tidyman, 87 Or App 488, 742 P2d 1202 (1987), and we allowed the city’s petition for review. For the reasons that follow, we affirm the judgment of the circuit court.
I. THE PORTLAND ORDINANCE
The ordinance at issue undertakes to deal with “adult businesses” by requiring them to locate at least 500 feet distant from any residential zone or any public or private school and, in some zones, at least 1000 feet from any other adult business. “Adult” in contemporary society and commerce (not to say culture) has come to be equated specifically with sexual conduct and erotic entertainment, and the ordinance includes “adult bookstores” among other “adult businesses” such as theaters, “adult arcades,” cabarets, “adult paraphernalia shops,” and “relaxation treatment” enterprises that are characterized by an emphasis on nudity or sexual activity. Portland Ordinance No. 155387, Portland Municipal Code § 33.80.030.1 The city adopted its cordon sanitaire approach to [178]*178the sex business in 1983 from a Detroit ordinance that had survived a First Amendment challenge in the United States Supreme Court, although without a majority opinion. Young v. American Mini Theatres, 427 US 50, 96 S Ct 2440, 49 L Ed 2d 310 (1976).
Meanwhile, however, this court in State v. Spencer, 289 Or 225, 611 P2d 1147 (1980), and State v. Robertson, 293 Or 402, 649 P2d 569 (1982), spelled out an independent analysis under Article I, section 8, Oregon’s guarantee of free expression. Article I, section 8, provides:
[179]*179“No law shall be passed restraining the free expression of opinion, or restricting the right to speak, write, or print freely on any subject whatever; but every person shall be responsible for the abuse of this right.”
Spencer and Robertson and their sequels2 emphasized that the clause is addressed to lawmakers at the time they consider making a law and forbids the enactment of a law directed in terms against any subject of speech, writing, or printing that cannot be shown to fall within an old or modern version of a well-established historical exception that the constitutional guarantees demonstrably were not meant to displace. This analysis was argued before the circuit court and on appeal. In 1987, while the Court of Appeals was considering the appeal, this court, finding no such well-established and demonstrably preserved historical exception for “obscenity,” invalidated laws against disseminating obscene material and against telephonic harassment that were written in terms describing the forbidden content of speech or printed material. State v. Henry, 302 Or 510, 732 P2d 9 (1987); State v. Ray, 302 Or 595, 733 P2d 28 (1987).
Henry and Ray were criminal prosecutions, and the court noted that they did not involve other forms of regulation:
“We do not hold that this form of expression, like others, may not be regulated in the interests of unwilling viewers, captive audiences, minors and beleaguered neighbors. No such issue is before us. But it may not be punished in the interest of a uniform vision on how human sexuality should be regarded or portrayed. We also do not rule out * * * reasonable time, place and manner regulations of the nuisance aspect of such material or laws to protect the unwilling viewer or children. Again, no such issue is before us. However, no law can prohibit or censor the communication itself. In this state any person can write, print, read, say, show or sell anything to a consenting adult even though that expression may be generally or universally considered ‘obscene.’ ”
State v. Henry, 302 Or at 525. See also State v. Ray, 302 Or at 602 (Linde, J., concurring) (laws might provide a compensatory rather than prohibitory remedy for injuries to “person, [180]*180property, or reputation,”3 by “abuse” of rights under Article I, section 8.) The city defends its ordinance as the kind of reasonable regulation of the “nuisance aspect” of sexually explicit material in the interests of “minors and beleaguered neighbors” left open in the quoted paragraph.
II. AUTHORITY AND COVERAGE
The city’s briefs below and in this court commendably deal with subconstitutional points of city authority and the text of the ordinance before addressing its constitutionality. See e.g., DeFazio v. WPPSS, 296 Or 550, 555, 679 P2d 1316 (1984); Planned Parenthood Assn. v. Dept. of Human Res., 297 Or 562, 564, 687 P2d 785 (1984); Carson, “Last Things Last”: A Methodological Approach to Legal Argument in State Court, 19 Willamette L Rev 641 (1983).
As to its authority, the city cites a provision of its charter that empowers the city to regulate the “use and management of buildings,” Portland City Charter § 2-105(a)(35). This charter authority concerns the physical use, maintenance and management of buildings for various purposes, including merchandising, but not the selective regulation of the kind of printed materials sold by a bookstore. But the next paragraph provides authority
“to regulate, restrain and to provide for the exclusion from the city, or any part thereof, of trades, occupations or businesses which are offensive or may in the opinion of the Council create or constitute a nuisance, and to regulate uses of land and structures within the city.”
Portland City Charter § 2-105(a)(36). To construe this paragraph as insufficient to authorize the ordinance before us would unjustifiably narrow the city’s powers under its charter. Cf. DeFazio v. WPPSS, supra, 296 Or at 569-70. The charter provides ample authority for Ordinance No. 155387, subject to constitutional limitations.
As to the text, the ordinance restricting the location of “adult businesses” defines an “adult bookstore” to be
[181]*181“an establishment having, as substantial or significant portions of its merchandise, items such as books, magazines, other publications, films, video tapes, or video disks which are for sale, rent, or viewing on premises and which are distinguished by their emphasis on matters depicting specified sexual activities * * * and/or nudity [as defined elsewhere in the city code.]”
Portland City Code § 33.80.030(A). An obvious issue under the text is whether a “substantial or significant portion” of the merchandise of an establishment that sells films and publications along with noncommunicative materials or that sells some materials covered by the definitions among other, non-erotic films or publications, means “substantial or significant” in isolation or proportionately, and whether it is measured by numbers of items in stock or by their sale or rental value. Defendants stipulate, however, that the ordinance covers their establishments. This brings us to the constitutional issue.
III. CONSTITUTIONALITY
Under Article I, section 8, of the Oregon Constitution, as applied in Henry and Ray, depiction of the “specified sexual activities” or “nudity” incorporated by reference in section 33.80.030(A) could not be outlawed entirely. The city, however, has placed the geographic restriction on “adult businesses” among its planning and zoning ordinances, and it maintains that the restrictions are the kind of “reasonable time, place and manner regulations” that the court did not “rule out” in the quoted passage from Henry.
The ordinance is a business regulation more than a conventional land use ordinance, because the same structure devoted to essentially the same kind of use, retailing reading or viewing materials or showing films, becomes a prohibited use under the ordinance simply because the quantity of its “adult” merchandise increases from a minor to a “substantial” or “significant” portion. Defendants contend that reasonable regulation of the location, physical facilities, or time and manner of operating bookstores cannot discriminate among such stores by the content of the books, periodicals, or other communicative materials they purvey. The city, in turn, argues that its distinction is based not on the content of [182]*182“adult” material as such but on the effects caused by “adult businesses” in their locality.
We note at the outset that the obstacle to the city’s distinction is not the constitutional guarantee of equal privileges and immunities, Article I, section 20,4 but the guarantee of free expression, Article I, section 8. If free expression within that guarantee were not involved, “adult” businesses could not insist that they must be treated exactly like any other business, not, at least, without a showing of being singled out for an impermissible motive.5 The constitution does not limit locational regulation to broad categories of structures or enterprises; if a city chooses to allow ice cream stores or beauty shops in residential areas but not taverns or dental offices, no guaranteed right like free expression is invaded.
Thus the city could regulate the location of a business that sells other merchandise, “adult” or otherwise, even if it purveys communicative materials, as long as selling such other merchandise is not permitted at the location. A grocery store gains no privilege against a zoning regulation by selling The National Enquirer and Globe at its check-out counter. The same applies to “adult businesses” that sell other merchandise besides books, pictures or records. Even structures and activities unquestionably devoted to constitutionally privileged purposes such as religion or free expression are not immune from regulations imposed for reasons other than the substance of their particular message. Many regulations are not impermissible laws “restricting the right to speak, write, or print freely on any subject whatever,” although they can be impermissibly applied in individual cases.
A regulation is not always unconstitutional because it restricts one’s choice of a place or time for self-expression or religious practice, when that is not the object of the regulation. The concern may be with the medium, not the message, as [183]*183when park regulations ban fireworks even for a Fourth of July celebration. To decline an exception from a land-use regulation for a theater, a printing plant or a church6 differs from attempting to restrict prayer meetings, film showings or desktop publishing in a residence, or in turn from enforcing safety codes or parking restrictions when a residence is so used. Similarly, it can make a difference whether a city imposes a permissible limitation on all location, time, manner, intensity, or invasive effect of some communicative activity (for instance, zones out all bookstores along with other commercial shops, or restricts all use of soundtrucks in residential areas to specified hours) or whether it concludes that limitations of number, frequency, density, or duration suffice to serve the city’s regulatory objective. This court has never held that an otherwise valid restriction must cover all or nothing, for instance that a city may not make evenhanded exceptions to an otherwise valid restriction against placing signs on utility poles, obstructing traffic for a civil rights commemoration, or using soundtrucks during a political campaign without having to make the same equally available to supporters of sports teams or to commercial advertisers.7 But that does not help the city here. This ordinance does not allocate priorities in intermittent and temporary exceptions or in use of scarce [184]*184opportunities created by the city itself;8 it is flatly directed against one disfavored type of pictorial or verbal communication.
The city argues that its ordinance meets the test of State v. Robertson, supra, because the ordinance “is concerned with the ‘effect’ of speech, not the speech itself.” If the ordinance were so written, it might well be valid on its face and subject only to scrutiny for valid administration; but it is not so written. The “coercion” statute at issue in Robertson made the undesired effect an element in the rule itself. What the law forbade was to compel or induce another person to unwilling behavior “by means of’ specified kinds of threats; the law did not forbid the threats as such. Threats that did not so compel or induce the addressee were not violations of the statute; at most they could be attempts. The Portland ordinance, in contrast, undertakes to prevent what the city believes to be the effects of the trade in sexually explicit verbal or pictorial material by describing the content of this communicative material.
The city attempts to cover this crucial gap by legislative assertions. It prefaced Ordinance No. 155387 with a list of findings, which recited the history of the city’s prior regulation of sexually oriented businesses and findings made in earlier years in adopting those regulations. These include that the city earlier “found” adult bookstores and theaters inherently incompatible with residential zones “because these businesses adversely affect the quality and stability of nearby residential and commercial areas,” that the “clustering” of adult businesses “tended to create or accelerate blighted conditions,” that subsequently “new forms of adult business” not previously defined were able to locate near schools and residential neighborhoods, and that it now was “appropriate and in the public interest to protect residentially zoned areas from the [185]*185conflicts resulting from close proximity to adult businesses” and to protect commercial areas from the reach of the restrictions. Portland Ordinance No. 155387, section 1 (9), (10), (19) and (21).
These “findings” are vague and conclusory. They leave unexplained what is meant by “the quality and stability of nearby residential and commercial areas,” by “blighted conditions,” and by “conflicts resulting from close proximity to adult businesses,” nor do they explain how the presence of an “adult business” causes specific effects that are incompatible with residential zones or blight commercial areas. But the problem is not vagueness or lack of detail in the “findings.” They do not purport to be findings of adjudicative facts (for which they are plainly inadequate) nor to be regulatory standards. The problem, indeed, is that they, or more concretely defined effects, are not part of the regulatory standards. These findings are only a recital of premises for legislation. As such, their vagueness or concreteness and their past or continued accuracy are immaterial. Their omission would not affect the validity of the ordinance. If legislative findings mattered, drafters merely would busy themselves with inserting whatever prefatory recitals courts have quoted in sustaining similar laws. But lawmakers do not need to find or declare the factual predicates for legislation, unless some special statute requires it, and such a recital gains nothing for the validity of the legislation, though it can sometimes help toward its purposeful interpretation. It is the operative text of the legislation, not prefatory findings, that people must obey and that administrators and judges enforce.
In short, the problem with the city’s asserted “concern with the effect of speech,” is that the operative text of the ordinance does not specify adverse effects that constitute the “nuisance” attributable to the sale of “adult” materials and therefore does not apply only when these adverse effects are shown to occur or imminently threaten to occur. Rather, the ordinance makes a one-time legislative determination that retailing substantial quantities of sexually oriented pictures and words within the proscribed area will have adverse effects that retailing other pictures and words would not have, and that it therefore can be restricted as a “nuisance” by a law [186]*186describing the materials rather than the effects.9 By omitting the supposed adverse effects as an element in the regulatory standard, the ordinance appears to consider the “nuisance” to be the characteristics of the “adult” materials rather than secondary characteristics and anticipated effects of the store. Such lawmaking is what Article I, section 8, forbids.
IV. SHOWING THREATENED EFFECTS AT TIME AND PLACE
The foregoing explains why we depart from the direction taken by the United States Supreme Court under the First Amendment.
The Supreme Court itself was unable to reach a majority opinion in Young v. American Mini Theatres, supra, which sustained the Detroit ordinance on which Portland’s ordinance partly was modeled. The plurality opinion, by Justice Stevens, would allow the city to regulate the location of “adult” theaters and bookstores more restrictively than other theaters and bookstores, though all of them purvey constitutionally protected materials, by assigning a lower degree of constitutional protection to sexually explicit expression than to other types of expression. Justice Powell, concurring, wrote that he was not inclined to agree with the view that non-obscene, erotic materials may be treated differently from other forms of protected expression, but he would sustain the ordinance because it did not significantly close off opportunities to show or to see erotic films. 427 US at 79. He thought that the case could appropriately be decided by the analysis of United States v. O’Brien, 391 US 367, 88 S Ct 1673, 20 L Ed 2d 672 (1968).10 Justice Stewart, writing for four [187]*187dissenters, saw the issue as one of “selective interference with protected speech whose content is thought to produce distasteful effects,” and maintained that “it is in those instances where protected speech grates most unpleasantly against the sensibilities that judicial vigilance must be [highest].” 427 US at 87.
After Young, lower courts divided on the factual showing needed before a city could restrict the locations at which otherwise privileged materials could be shown or sold. See Weinstein, The Renton Decision: A New Standard for Adult Business Regulation, 32 Wash U J Urb & Contemp L 91, 97-102 (1987) (reviewing the cases). The obvious problem is that when a locational restriction is justified by only the secondary effects of showing or selling constitutionally protected materials, the restriction is unconstitutional if the feared effects do not exist.
In 1986, the Supreme Court nevertheless sustained a city ordinance that limited the showing of “adult” films to theaters located within a 520-acre area. Renton v. Playtime Theatres, Inc., 475 US 41, 106 S Ct 925, 89 L Ed 2d 29 (1986). Renton’s approach was to concentrate what Detroit sought to disperse. The effectiveness or reasonableness of one rather than the other policy would be immaterial to its validity if constitutionally protected materials were not involved. The majority opinion in Renton, however, contained two propositions that differ from this court’s decisions under Article I, section 8. The Court stated that a motive to suppress the disfavored expression would not invalidate an ordinance as long as a concern with secondary effects of the expression was predominant. 475 US at 47-48. Also, the Renton majority held that the city did not have to show that dissemination of “adult” materials outside the specified zone would have the feared consequences; the city could rely on the legislative findings or the experience of other cities as the basis for its own restrictive law. 475 US at 50-52. Subsequently, the Supreme Court explained that “secondary effects” as used in Renton meant something other than the impact of the content of the regulated communication. Boos v. Barry, 485 US _, 108 S Ct 1157, 99 L Ed 2d 333 (1988).11
[188]*188Our cases under Article I, section 8, preclude using apprehension of unproven effects as a cover for suppression of undesired expression, because they require regulation to address the effects rather than the expression as" such. The statute at issue in State v. Robertson, supra, prohibited causing a harmful effect, coercing another into undesired conduct. The court invalidated the statute for overbreadth, because it specified coercion by “threats,” which covered privileged as well as unprivileged speech. 293 Or at 435-36. Similarly, the terms of the statute at issue in State v. Moyle, 299 Or 691, 705 P2d 740 (1985), prohibited intentionally causing a harmful effect (alarming another person by threats), and the Moyle court found it possible to save the statute by interpreting it to require genuine threats that are objectively likely to be followed by unlawful breaches of the peace. Id. at 705. The Portland ordinance, to the contrary, in terms restricts the marketing of the described communicative material, not only the effects of this marketing.
The city need not await the actual occurrence of substantial harm to a neighborhood before it invokes a non-punitive, purely locational land use restriction. But when the terms of such a restriction include the specified harm from particular forms of expression, application of the ordinance necessarily requires showing the reality of the threatening effect at the place and time, as stated in Moyle. It would not presume the effect by a generalized rule against the substance of the expression.12
[189]*189Ordinary legislation faces no such test, because ordinary legislation does not undertake to restrict constitutionally privileged activity. Ordinarily, lawmakers may tackle a perceived problem on any theory of its causes, farfetched or realistic, or by acting on their constituents’ beliefs about the causes. Not uncommonly they simply copy a law from other states or cities without making any local diagnosis, particularly if the law has been sustained by a court, as the city did here. The resulting enactment remains law until it is repealed. It remains the law whether or not the diagnosis or the cure ever was realistic, or remains realistic under changed conditions. This principle applies to land use regulations as to other legislation. If retail business is excluded from a residential zone to keep down heavy traffic and noise, the exclusion bars an antique store that attracts only a half dozen quiet visitors a day. But the principle does not permit regulation in the form of a general law “restraining the free expression of opinion, or restricting the right to speak, write, or print freely on any subject whatever,” in the constitutional words.
It is not a technical detail of drafting that such a restriction must specify the proscribed harm and not only the expression that is thought to threaten the harm. The role of the requirement is shown by the history of political, social, and religious issues far more central to the constitutional freedom of expression than the kind of “adult” materials covered by this ordinance. Legislatures often have made (and copied) laws restricting political expression because of consequences feared at the time, and some courts have deferred to those legislative judgments. See, e.g., Gitlow v. New York, 268 US 652, 45 S Ct 625, 29 L Ed 1138 (1925) (sustaining “criminal anarchy” law against radical advocacy, adopted a quarter century earlier after the assassination of President McKinley). Later, in Communist Party v. Control Board, 367 US 1, 81 S Ct 1357, 6 L Ed 2d 625 (1961), the Supreme Court sustained a statute based on a lengthy recital of congressional “findings” whose truth the Communist Party was not allowed to question, though the facts had changed and continued to change.13
Expression that is offensive to many is likely also to [190]*190be seen as harmful, and there is little political incentive to repeal laws made in apprehension of harm from offensive expression when the danger fails to materialize, as those examples show.14 Thus it is important that the constitutional guarantee restricts lawmakers, as this court noted in State v. Spencer, not merely the unconstitutional application of laws. The facts respecting the commercial distribution of sexually explicit materials also undergo continual technological as well as social change. The invention of photography, producing first still and later moving pictures, and of means to print photographs in magazines changed what previously had been a trade in the written word, and the invention of video cassettes playable on television sets has revolutionalized the entertainment market once again. See Beaver, The Awkward Embrace: The Legal Battle Over Obscenity, 2 Gannett Center J 81, 87-89 (1988) (reporting on wide use of pornographic videotapes); Groskaufmanis, What Films We May Watch: Videotape Distribution and the First Amendment, 136 U Pa L Rev 1263,1284-90 (1988) (describing the rapid proliferation of the medium and some early regulatory reactions).15 If a law [191]*191specifies the harm and not only the expression, its valid application depends on demonstrating the specified harm under changing conditions, not on mere apprehension.16
V. CONCLUSION
We do not retreat from our statement that the decision in State v. Henry did not rule out “reasonable time, place and manner regulations of the nuisance aspects of [‘adult’] material or laws to protect the unwilling viewer or children.” It is not for us to spell out what such regulations should be, but some illustrative possibilities are obvious. If some effect other than exposure to offensive communication as such is considered a “nuisance,” a regulatory law might define the feared effect and, within constitutional limits, provide for administrative prevention proceedings, or for persons within the supposedly threatened area to initiate such proceedings, or perhaps provide such persons with a civil damage remedy if the feared effect actually causes harm. But the regulation must be addressed to whatever the government identifies as the harmful effects accompanying the trade in the material, not only describe the material itself. A law focused on the risk of specified harm leaves it incumbent on government to demonstrate that risk when and where the law is to be applied rather than rest on previous legislative declarations at the time of enactment. The Portland ordinance fails that test.
The decision of the Court of Appeals and the judgment of the circuit court are affirmed.