Like his Sisyphus machine, Bruce Shapiro's EggBot also harnesses the science of motion control for the purpose of creating art. But the latter machine's "canvas" is a lot smaller, and potentially more interesting: 

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Anything that's vaguely spherical in shape—an egg, a billiard ball, a Christmas ornament, or even the bowl of a wine glass—is fair game for the EggBot. Here it is in action, working on the original object it was designed for:

Here it is doing a lightbulb:

Shapiro invented the machine way back in 1990, and has since created several iterations, including the EggBot Pro in conjunction with Evil Mad Scientist. Martha Stewart invited Shapiro onto her show to demonstrate the various iterations, and you can see the (unembeddable) video here (and flinch along with us every time Stewart calls the machine a "robot").

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The entry-level $195 EggBot comes in kit form, and is meant to be a fun way to introduce kids to motion control. But for serious Easter celebrators, the top-of-the-line EggBot Pro is made from CNC-milled aluminum parts and comes ready-to-go. Amusingly, there's also an Ostrich version made to deal with larger-sized eggs and objects. Check out the full line-up here.