Here are a few pictures from the Haptics Class Project Open House on April 30, 2010.
A Simply Demonstrated Tactile Illusion: "Chopstick" IllusionThis paper analyzes a simply demonstrated tactile illusion and discusses its limitations and some application purposes. The tactile illusion in question here is a so called "chopstick" illusion. This is demonstrated on the edge of a wooden medium thick smooth chopstick half held between the fingertips of the thumb and index finger. The edge is made so that there is only a gradual constant increase in the surface dimension and no change in thickness of the material. While the fingertip midpoint of the tip of the thumb and index finger are run over the this edge, while looking away from the surface, a tactile illusion is experienced in that the observer feels as if the thickness of the material at the edge of the chopstick half increases, but in reality does not.