Shadow Art

Via Neatorama, a link to Fred Eerdekens, a Belgian artist who combines sculpture and light to create text.

In the example below, you'll see two artifical trees that, when light is projected through at the correct angle, create shadows that spell "mhmmmhm."



Eerdekens also makes Calder-like scupltures that utilize the same effect. Some of these even spell different words depending on the angle of the light. Excellent!

EDIT: Fred's website appears to be down! Link to the Spencer Brown Gallery, which has a few pictures of Eerdekens work.