Apple's smartwatch, colloquially called the iWatch, promises to be a highly capable computer that fits around your wrist. It'll be commercially available in just a couple weeks.
But old school computer users may prefer something a bit more retro. Do you remember the Apple II computer line? It was the first computer I ever used back in the early 1980s. The Apple II introduced an entire generation into personal computing. And now, thanks to Instructables member Aleator777, you can have one on your wrist.
His Apple II Watch looks like a tiny version of the original desktop computer. Like a lot of computers from back in those days, you'll have to build one. His step-by-step instructions, design schematics, and code should get you started.