Every year, E Ink (the company most famous for the screen on your Kindle) trots out a number of unusual prototype devices to show how its technology can be used in other ways besides e-readers — but this years definitely takes the cake. Witness this meter-long digital clock, with a huge E Ink screen. E Ink actually built the clock a few years ago as a prototype, but a Boston-based company called Twelve24 is actually going to sell the device, now known as the ClockOne. It comes in six different colors and itll be available soon for the somewhat steep price of $499, but again — its hard to put a price on giant, E Ink clock.