Was reading an article in Artforum and it reminded me of this Yoko Ono piece, Play It By Trust (1966). Although not a big fan of her work, I appreciate her part in Fluxus. The idea with this piece was that the players lose track of their pieces as the game progresses; ideally this leads to a shared understanding of their mutual concerns and a new relationship based on empathy rather than opposition. I've always liked this piece. Maybe I'm just fed up of opposition right now.