The demonstration of moire effect

Visitor electrically rotates a disc. Black and white curved and converging stripes as if flow into the center of the  disc. Observe the spiral, slightly hypnotic effect.

Stand in front of the construction with of the pattern on the wheel so that you comfortably see the graphics and reach the switch under the circular cutout. Turn on the switch, to spin the wheel with graphics. After a moment of staring at the rotating pattern (just a few seconds suffice) the human visual perception becomes so
misguided that shifting attention to anything around you find that the perceived part of the object undulates, respectively is moving in a similar way as the previously observed pattern. After a short time of running the electric circuit rotating the disc switched itself off. For its reactivation just activate the START button. 

Dimensions: 120 cm x 80 cm x 80 cm