‘I have no problem with drawing on all that European culture has achieved in terms of space. Art represents space, because you cannot experience space outside of art. Someone like Fontana is saying that — space is concrete. The American idea of concrete is like cement. The European idea of concrete is much more a concept than a material’ (R. Tuttle, quoted in, P. Marshall, ‘Walking on Air: Conversation with Richard Tuttle’, in Art in America, April 2009, reproduced at http:/www. artinamericamagazine.com/news-features/interviews/ richard-tuttle-walking-on-air-pace-wildenstein-1/).