In a northern Melbourne suburb empty milk cartons float in buckets which collect rainwater from a sloping tin roof. With the easing of a heavy summer downpour the cartons become acoustic hollow cylinders that operate like percussive instruments. Passing cars and trucks from the nearby road provide a low irregular bass which grows in volume as the storm passes. The naturally and unnaturally occurring sounds create their own cyclical rhythm and metre and constitute a form of aural pattern-making.