What is <a href='http://www.222gallery.com/store/art/xhnd/main_x.html' >xHAND</a>?

222gallery sent out Non-Repro blue pens and specially designed carbon copy packets to all of the artists associated with the gallery. Each packet contained a white top layer, a green second layer, a yellow third layer, a pink fourth layer, and another white fifth layer. Each xHand packet was sealed on all sides, leaving only the top layer visible to the artist.