This interactive art piece from Italy/Portugal-based architects Moradavaga, called HEUREKA!, is basically a very large kaleidoscope that you operate manually by turning bicycle wheels. It is certainly not the simplest kaleidoscope ever made, but it is among the coolest. Moradavaga conceived it as a "thinking space," so that instead of taking a long walk, you can now just head over to the bicycle wheels, stick your head inside the wall, and talk the crank while contemplating all the different shapes and colors.
• HEUREKA! installation by moradavaga uses bicycle wheels to illuminate kaleidoscopic space [design boom]