Optical and visual illusions intrigue us because we know what we are seeing isn’t real. How optical illusions work is by tricking your brain, making you think an image is moving when in reality it is stationary.
SCINTILLATING GRID The scintillating grid is an illusion created by superimposing white dots at the intersection of gray lines on a black background. Dark dots seem to appear and disappear at the intersections, and jump around the grid, thus the term “scintillating.” Trying to pin down one of the black dots with your gaze is like playing a hands-free version of Wack-a-Mole, as the dark spots only appear in your periphery. Antonio Miguel de Campos