Constant and his daughter Martha, 1969.

Ludic stairs designed by Constant at the Amsterdam Museum, 1969.

Ludic stairs at Amsterdam Historical Museum, 1969

Constant playing cymbalom at a party at Wittenburg, 1969

Constant amongst his models, Klein Labyr and Spatiovore [V] at his studio Wittenburg, Amsterdam, circa 1968

Constant sitting amongst his models, Diorama [II], Twee torens and Spatiovore [V] in his studio, Wittenburg, Amsterdam, circa 1968.

Constant and Viktor amongst all the models in his studio Wittenburg, Amsterdam, circa 1968.

Ready for battle?