Whoa, check out the man going crazy on his rocket sled swingset!
This image if from Ivorypress's new mook, Jean Prouvé 1901-1984, which is apparently/obviously pretty sweet. You can buy it from Walther Koenig, and/or see some more vintage Prouvé photos from it at Mondo Blogo.
New Jean Prouvé "book" [mondo blogo]
Prevously: FOUND: that Jean Prouve swing set