Make a glass cube or use an exiting squash court with a glass viewing wall. Mount four automatic tennis ball canons on a mechanism that’s robotically programmed to rotate and built into the roof of the cube/court. Create a false floor that will funnel the tennis balls into a return mechanism to replenish the canons on a perpetual basis. Fill each machine with different Colours of tennis balls. Stand underneath the canon assemble and viola. The tennis balls are fired and the subject attempts to return or play the balls or ball if at all possible. Move between active optimism and concentrated action to static hang dog dejection as the balls continuously move.