Synaesthesia Illustrated

If you have synaesthesia, then you might see colours like this: Chromatic-full screen. I highly recommend that you also check out some of the interesting variations on the top right.

The idea is pretty simple. A full rotation takes 3 minutes. The largest circle will travel the circle once. The second largest (which is imediately to its left, at the start) will travel around the circle twice, the third three times, and so on. The patterns are really fascinating.

(Hat tip: Crooked Timber)