Possessing a huge ground-floor space in SoHo is this 1979 establishment by the late American craftsman Walter De Maria. The work comprises of 500 strong metal bars, situated in five equal lines, with the space between the poles expanding by 5mm with each continuous space, from front to back. The outcome: a lively disruption of spacial discernment. The bars have all the earmarks of being indistinguishably divided, despite the fact that at the back they’re practically 2ft separated. No photographs permitted.