->I shall not today attempt further to define the kinds of material I understand to be embraced within that shorthand description ["hard-core pornography"]; and perhaps I could never succeed in intelligibly doing so. '''But I know it when I see it''', and the motion picture involved in this case ["The Lovers"] is not that. [Emphasis added.]
--> —Justice Potter Stewart, concurring opinion in ''Jacobellis v. Ohio'' 378 U.S. 184 (1964)
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