New York: Sound

Tuesdays are the rattle of aluminum cans, the dull tink-clink of bottles knocking against each other. It's the night before recycling collection, and bags of metal, glass and plastic line the sidewalks in haphazard piles - a monstrous xylophone dismembered and scattered up and down the New York grid.

What other musicians to play the giant sidewalk instrument, but the homeless? Some rake through the piles con fuoco, producing a rapid cacophony of cans, while others search slowly enough for one to distinguish between the different pitches of empty or partially-filled bottles. Sometimes the tumbling glass crescendoes to a halting shriek as a particularly large bag is hauled a short distance.

Singly or in groups, with gloves or bare hands, loading backpacks or bulky shopping carts, they rifle through countless bags of recyclables, searching for the right containers to turn in. In colonial times you could cheat the natives into selling you huge tracts of land for glass and metal beads. Nowadays all you get is enough change for a burger.

Tuesdays ring with the sound of trash en route to becoming not treasure, but survival.