According to the dictionary, this sense is "etymologically obscure". "Camp" in this sense has been suggested to have possibly derived from the French term "se camper", meaning "to pose in an exaggerated fashion". Later, it evolved into a general description of the aesthetic choices and behavior of working-class gay men. The concept of camp was described by Christopher Isherwood in 1954 in his novel "The World in the Evening", and then in 1964 by Susan Sontag in her essay and book "Notes on "Camp"".