Here’s another of those arty watches from Tokyoflash Japan. The Kisai Optical Illusion Watch has a touchscreen for accessing the four main functions. Like those optical illusion posters from years ago, the time display is buried in a pattern of high-resolution digital lines. Once you’ve trained your eyes, you’ll be able to see the time. Until you’ve trained them, or perhaps if you never do, there’s a button that clears up the background lines when touched. The Optical Illusion is a limited-edition watch with a mineral crystal lens with either a natural or green face and a stainless band and clasp available in silver or black. The watch is $199, but it’s available for $179 with free shipping until Friday January 27th, 2012 at 11:30 am (Japan time).