The "Octapult" is a kinetic sculpture designed and built on commission by Bradley N. Litwin of Philadelphia, PA. With 8 synchronized catapults, 160 plastic balls per minute are launched, caught, and recirculated. Made mostly of wood, the work is ~36 inches in diameter.

This guy makes amazing machines. Watch him throw a ball into the air, catch it, and throw it again. From the submitter: This is the most demanding catapult machine design I've attempted, to date.... more inside

Kinetic sculpture with 4 ball catapults. Oak, oak ply, copper, steel and brass construction. Approx. 22"sq x 14"h on 4ft base.

Completed in September 2007, "The Sway of Public Opinion" measures approx. 15" diameter x 10" high, made of wood, aluminum, steel, brass, and copper.

Taken from the youtube description: Brad's first attempt to subvert the limits of the known universe. Over a period of use, the device has been utilized for the continuous abuse of countless atomic structures.... more inside

From YT: Commissioned by the Dupage Children's Museum, in Naperville, Il. This oversize thumb piano machine can be set up to play an endless variety of melodies and rhythms by manipulating a stack of pinned cams. copyright ©2008 Bradley N. Litwin

From YT: Tetra-Cycling: now is the time to make circles with mints. A kinetic sculpture by Bradley N. Litwin, approx. 30" diameter x 33" high (maximums), wood, metal and plastic.