Constant. (1967) Cross section for Large Yellow Sector © Collection Fondation Constant, Amsterdam.

Constant. (1974)New Babylon Theory Collage No.8 ©Collection Gemeentemusem Den Haag, The Hague, The Netherlands.

Constant. New Babylon (2015) [Exhibition]. Museo Nacional Centro de Arte Reina Sofía, Madrid. October 21, 2015 – February 29, 2016

source: http://www.bmiaa.com/creative-play-constants-new-babylon-arrives-at-mncars/