First we had Danielle Darrieux showing her flexibility on a trapeze, followed shortly thereafter by Joey Heatherton attempting a more advanced contortion, now today American actress Constance Dowling—older sister of reliably awesome actress Doris Dowling—shows she needs no device at all to turn herself into a pretzel. Dowling got her start on Broadway and later appeared in films such as Black Angel, Stormbound, and the unforgettable sci-fi thriller Gog. This pose is called a backbend today, but when the photo was made in 1944, it was known as a backstand. In either case, it looks like a pretty useful position.
Ah, I see it now. It rolled under the sofa.