At face value these small hand-carved wooden sculptures by scientist and artist John V. Muntean appear to be a random amalgam of mixed geometric shapes, curves and holes, but shine a light at the right angle and suddenly in the objects shadow is a discernable image. In fact, each sculpture contains three images, usually revolving around a theme. Via his website:
A Magic Angle Sculpture appears to be nothing more than an abstract wooden carving, skewered with a rod and mounted on a base. However, when lit from above and rotated at the magic angle (54.74º) it will cast three alternating shadows. Every 120º of rotation, the amorphous shadows evolve into independent forms. Our scientific interpretation of nature often depends upon our point of view. Perspective matters.
Muntean has numerous videos showing how each piece works, I definitely recommend spending a few minutes poking around. You can also follow along via his blog, and inquire about purchasing a piece. (via neatorama)