The visitor to an Art Arena game is confronted with an enormous piece of paper covering one wall of the room. Groups of players are at work painting, some with spontaneity or abandon, others with thoughtful precision. Back from the wall are knots of players calling our apparently cryptic information to those at work on the paper, or transmitting it in coded sounds using whistles, pipes and various home-made instruments. Colours are phased across the wall, sometimes colliding, sometimes min...