Part of their Forever! series, BCXSY designed this polygonal aquarium so that fish endlessly swim around the geometrical shape. Similar to modern-day insane asylums, which are designed with connected lap-like hallways instead of dead end hallways, the fish can swim around in circles 'till their heart's content.
It's hand-crafted from hand-cut glass and you can find more info and a video at BCSXY
via Yanko
Also on Cool Hunting: Labyrinth Aquarium and BCSXY: Golden Glory