If the two dots are switched on and off in quick succession it would appear that a single dot was moving from place to place.
It was first written about in the 1912 book Experimental Studies on the Seeing of Motion. Suppose an image of a red dot is projected on a chalkboard and then is switched off and reprojected it on the board a foot to the left. If the two dots are switched on and off in quick succession it would appear that a single dot was moving from place to place. For ten points, identify this phenomenon first identified by Max Wertheimer and named for a Greek letter.
It was first written about in the 1912 book Experimental Studies on the Seeing of Motion.
{Phi} phenomenon