Bruno Munari Concave-Convex, sketch and final result 1947.
Installation at Estorick Collection of Modern Italian Art, London 2012. Photo by ©Pierangelo Parimbelli. Study to concave-convex. Last but not least: Signore Munari experimenting with his objects in his studio in Milano in 1949 © Massimo & Sonia Cirulli Archive.