One of two large Thomas Hirschorn pieces at Frieze, the more I see his work the more impressed I am by it and he's now 42 in the art power list. When I was looking at this there were two young Americans taking great offence at what they saw as it's anti-american stance.

Nobuyoshi Araki's A/film light box with slide strips, one of three at $70,000 each which sold out with the gallery reporting that demand was so high they could have sold 100s of them.

More images of both in my Flickr Frieze Set