The junk mail Americans receive every day could produce enough energy to heat 250,000 homes for one day.

Left: Harry Anderson (b.1943), 'Twister Lamp'. Glass, brass and found objects. Photograph: Michael Ahearn.
Right: Pippa Garner (b. 1942). 'Fan Lamp', 1988. Table fan with light bulb. Photograph: P. Garner.