In many cities, payphones are rapidly disappearing from the streets, which is no real surprise in a world where most people carry a cellphone. But what do you do with all those old phone booths? A Japanese art collective has come up with their own plan, and are turning Osaka's disused booths into giant fish tanks.

Does your fish live in a bowl or a rectangular tank? Has he or she been looking a little depressed lately? Do you even know whether your fish is a he or a she? Look, fish are people too, and they deserve more than just some rocks, a few fake plants, and a treasure chest that intermittently pukes bubbles. Take a look at this gallery of 27 (or so) geeky, weird, and occasionally dangerous fish tanks and let them inspire you to upgrade the digs of your fishy little friends.

Here's a concept fish owners (or fish who are owned by children) wish was real: a robotic fish feeder. A unit like the Fifer would probably serve a pond better than a fish tank as it's designed to deliver...