|Fall colors near Ouray, Colorado.|
This photo of fall aspen colors is posted pursuant to the Colorado Photography Act of 1964 (familiarly called the "Ektachrome Law"), which requires that all professional and semi-professional photographers in the state—essentially anyone who has ever sold a photo—shoot at least one full roll of slide film on scenic shots featuring golden aspen groves.
That most photography is now digital appears to have escaped the legislature, which has not updated the statute's language.
(Journalist/blogger Hal Walter demonstrates his legal compliance as well. Con Daly is not in compliance, thus far.)