"Technically speaking, the maze-like array of diagonals you see above is actually showing you the time. But, as is Tokyoflash’s wont, the point here isn’t so much about time itself as it is about the journey of figuring it out. Well trained ninjas might be able to decouple the numbers from their unhelpfully similar background, but for the rest of us this "Optical Illusion" LED watch will be an enigma of random black lines wrapped inside a lime green mystery. Thankfully, it does come with a button to clear away the mists of confusion if you ever need to, you know, actually tell the time."
Tokyoflash reaches new heights of unreadability with latest concept watch — Engadget
(Thx again Piers!)