I had a small aquarium when I was a kid and I dreamed of a larger one, or an aquarium I could mount into my wall. When I saw this I suddenly got the urge to keep fishes again. Its from Opulent Items, I’ve never seen that site before and its worth a visit. Check this out, these fishes can swim freely between the modules:
The photo is without cables and air supply so I guess it won’t be _this_ tidy but I think it was neat anyway.