I admit, I don’t know the story behind this one. It popped up on suplove (warning, music) a few hours ago and is entitled simply “Blitzstein Exhibit” and is dated 1994 on the bottom. Edvard Munch approved.
Update: Via email Nathan Bowers says: “The Blitzstein Exhibit is on Fairfax in L.A. Across the street from Canter’s Deli. The piece you linked is in the storefront window. I can’t tell if the place is a gallery or a studio because I’ve never seen anyone inside and none of the pieces have seemed to move since at least 1996. Mysterious!” It looks like this is a piece by Harry Blitzstein, and here he is jumping rope on a trampoline. Thanks Nathan!