Google Maps mash-ups are just the breast, aren't they? Especially when they're as time-sucking as James Bridle's Rorschmap, which turns satellite images of the world into kaleidoscopes worthy of being stuck at the end of a plastic tube.

But can you guess which cities have been kaleidoscoped in the gallery here? I'll give you a clue: the six images include San Francisco, Amsterdam, Tokyo, Dubai, London and Australia's Alice Springs. If you really need an incentive to work them out, I'll award Spotify invitations to anyone who guesses correctly. [Rorschmap via Boing Boing]