Occupying a cavernous ground-floor space in SoHo is this 1979 installation by the late American artist Walter De Maria. The work consists of 500 solid brass rods, positioned in five parallel rows, with the space between the rods increasing by 5mm with each consecutive space, from front to back. The result: a playful subversion of spacial perception. The rods appear to be identically spaced, even though at the back they're almost 2ft apart. No photos allowed.