Double Take. Norman Rockwell (American, 1894-1978). The Saturday Evening Post, May 10, 1941.
Rockwell has the viewer seeing a glamorous, mature woman superimposed onto the body of a young co-ed who is reading, naturally, The Saturday Evening Post while her school books are stacked on her lap. It works well as Rockwell has handled it in such an off-hand manner, so that the viewer is deceived by the casualness of the composition and caught off guard.
