Birds and fish have really drawn the short end of the stick when it comes to dwelling design. So I was delighted to come across Duplex, a bird cage topped with a fish tank. The design of the aquarium was molded convexly to create a space where the bird flies and the fish swims at the same height, creating a visual encounter between the two. Beyond that, this air and waterworld fusion is absolutely stunning with its wooden cage bars and tall, bulbous shape. I never liked cleaning the algae out of fish bowls, but for the Duplex, I'd do anything.