Morellet's Tirets illusion makes small circles appear and disappear as the eye moves over the above figure, a modified version of the painting Tirets by Francois Morellet (Seckel 2002).
Morellet's Tirets Illusion
See also
Moiré PatternExplore with Wolfram|Alpha
References
Seckel, A. The Art of Optical Illusions. Carlton Books, p. 31, 2002.Referenced on Wolfram|Alpha
Morellet's Tirets IllusionCite this as:
Weisstein, Eric W. "Morellet's Tirets Illusion." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/MorelletsTiretsIllusion.html