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 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).