Boris O'Klein: O'Klein sold a series of "Naughty Dog" and "Naughty Cat" hand-colored etchings which were produced in France during the 1930's They typically featured dogs tormenting cats, or cats tormenting dogs, frequently either in sexually suggestible situations or while they were trying to relieve themselves. Hence the terms "Naughty Dogs", "Naughty Cats", or more simply, "Bathroom Art". A series of machined-produced O'Klein prints appeared in the 1970's and there are contemporary hand-colored productions being reproduced today.