Kind of a gadget, a ring with gears.
Gear ring $165 see it in action: http://media-cache-ak0.pinimg.com/originals/2d/e9/af/2de9affa33b344f896ae51fb52968e45.jpg
HOW COOL! -- find it here: http://www.kinektdesign.com/product-gear-ring.php
Gear ring! I would never stop twisting the ring..... lol
steampunk wedding ring - Google Search
Neat spinner ring
Gear ring <gif>
Canon's latest creation!