The visual system adapts to spinning motion in Spinners. When visitors first stare at a spinning spiral, it appears to move in and out. By continuing to stare for 15 or 20 seconds, one set of motion detectors in the eye becomes tired, and the motion of the spiral appears to stop. By looking away from the spiral at something stationary, the opposite set of motion detectors takes over and visitors will briefly see motion in the opposite direction. The visitor can also experiment with a pattern of rotating dots.