Gears Are Really Awesome and Complicated

You bet they are. Gears that are practical have to withstand pretty large forces, like the gears in a car transmission. Gears in power generation stations have to withstand even larger forces. In these applications simplicity is key, but what about applications that can benefit from some complicated gear shapes? Well, there aren't any (at least not yet), but there is always art. Check out the videos below of a cube gear and a heart gear.

Kinekt Design Gear Ring

This gear ring actually moves! I'm generally not a fan of jewelry (I'm a dude), but this thing is pretty sweet. It would give me something to play with at all times, but I just wonder if the skin on my other fingers would ever get caught in the teeth. And I hope when it gets dirty (as it inevitably will) it doesn't seize, but it is made from  stainless steel so there are no worries about it rusting. All in all, a very neat idea that I would actually wear, for a reasonable price. Check it out at Kinekt Design.