These modern betta fish bowl designs from Zero Edge Aquriums are sculptural alternatives to the classic round fish bowl. The interesting designs are made from cast acrylic and the part where the fish swims is in a U-shaped bend.
The designs are spacious enough to allow small pebbles and rocks to be incorporated and some of the larger models even have hidden filtration systems built into the back. Instead of being completely clear, designs like the 'Aqua U' have an opaque backing in a black or white color, which conceals the filtration system behind and helps to keep the water in the tank fresh. For tanks with more than one fish, this is a beautiful alternative to an ordinary rectangular tank.