Just 3 little pigs – a film strip in motion

This one is less of an optical illusion postcard and more of a odd little risque joke postcard. It was postmarked Brooklyn, New York, 1940. On the back is written:

Dear Annette, How are you? Sorry I didn’t write sooner. I’m in Coney Island for the rest of the summer. Look for yourself on the front. Love, Evelyn