Constant in pyjama with his pet monkey Jocko after a truck had run over his foot while he was walking his dog, 1961.

Constant with his pet monkey Jocko at home after a truck had run over his foot while he was walking his dog, 1961.
On the back in Constant's handwriting: Will you behave from now on...?

Constant and his pet monkey, Jocko.

Constant's pet monkey, Jocko on the model Orient Sector, 1961

Constant, his dog Herta and his pet monkey, Jocko.

Opening of the exhibition Constant-Amsterdam, Städtische Kunstgalerie, Bochum, 1961.

Constant playing the guitar

Schulze Fielitz, German architect, and Swiss painter André Thomkins in front of model Red Sector in Bochum, 1961.

Constant and Aldo van Eyck receive the Sikkens Award for their publication Spatiaal colorisme in 1960.
F.l.t.r. Professor van den Broek (TU Delft), Constant, Aldo van Eyck and unknown man (maybe presentor).

Constant and Red Sector, 1960
On the back in Constant's handwriting: The director explains....