This one’s pretty old, but I just heard about it thanks to a tip from that great guy @patrickpatience. ZeroWatch is a… [copy-paste]:
The concept of the ZIIIRO Watch is a clock face without hands or markings, instead a constantly changing pattern of rings indicates the passing of time. The main theme is minimalism, so there are no distracting elements in the design, after a short time you will acquire a feel for reading the time.
Best of all, it’s free. Even better, it’s a real watch you can strap on your wrist. The real one’s called ZIIIRO, and comes in several colours and styles, costing around 110 euros. Both cool.