plural of flash-lag illusion

A tactile illusion where tapping separate regions of a person's skin in rapid succession (e.g. the elbow and the forearm) gives the impression of sequential taps "hopping" from one point to the next, even though the intermediate points were never touched.

plural of café wall illusion

An optical illusion in which the parallel straight dividing lines between staggered rows with alternating dark and light "bricks" appear to be sloped rather than parallel.

An optical illusion where, when a diagonally striped pole is rotated around its vertical axis (horizontally), it appears as though the stripes are moving in the direction of its vertical axis (downwards in the case of the animation to the right) rather than around it.

plural of barber pole illusion