holy crap...
Untitled (Blue and Light Blue) is one of the newer bongs. I recently retooled the design to make it sturdier and improve the water seal. The piece consists of thirteen vertical tubes arranged in a circle, rising to a height of over eight feet. It features two smoking stations which operate completely independently (i.e. smoke is not shared between users).
The upper (light blue) parts of the tubes are filled with water. An air pump produces a constant stream of bubbles in the odd-numbered tubes (see diagram at below left). When the pipe is smoked, the user causes the remaining tubes to bubble.