Sweepers Clock by Maarten Baas (San Francisco)

Is on display at The Exploratorium in San Francisco, California.

http://www.exploratorium.edu/arts/works/sweepers-clock

Maarten Baas combines theater, art, film, and design in Sweeper’s Clock to make a 12-hour-long movie in which two performers replicate an analog clock by sweeping two piles of garbage (one for the hour hand, one for the minute hand) to indicate the time.

http://www.maartenbaas.com/

Sweeper Clock by Maarten Baas from Dezeen on Vimeo.