
Bik Van der Pol, ‘Are you really sure that a floor can’t also be a ceiling?’ (2011)

Claes Oldenburg and Coosje van Bruggen, ‘Dropped Cone’ (2001)



Martin Kippenberger, ‘Metro-Net’
Kippenberger imagined a global underground metro system and started to construct entrances to it in different cities around the world.