Designed for the Museum of Modern Art, NY, this unique calendar can be used year after year thus making it an eco-conscious product. The calendar placed on a desktop, or mounted on a wall, its string-tethered seemingly gravity-defying ball is suspended in mid-air, and manually moved to mark each month. A second ball on the horizontal beam indicate the day. Constructed of injected-molded ABS recyclable polymer and magnets.

The new small version, designed in 2008, commemorates the 10th anniversary of the original design.