Hermann Grid Illusion
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEge0jx9hs_WDMC1fz4p6bevjB3FbE1AZI_QcwIDzXCeKBH9ZE7-8Xndsf3CASq7JfunZKzWUhBu1WywMU_ZbDIa1kuJpfrITyqqqWuimY_FpGhozol9aUbrOObcZdhsyTIHnVyEwYc3bn8/s1600/rotsnakemini.gif
With this illusion, you can see little gray dots in between the squares as you look at the picture. But when you look away, the squares disappear. Lateral Inhibition causes anything surrounded by a dark area to seem lighter and vice versa.
Rotating Snakes
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEge0jx9hs_WDMC1fz4p6bevjB3FbE1AZI_QcwIDzXCeKBH9ZE7-8Xndsf3CASq7JfunZKzWUhBu1WywMU_ZbDIa1kuJpfrITyqqqWuimY_FpGhozol9aUbrOObcZdhsyTIHnVyEwYc3bn8/s1600/rotsnakemini.gif
The concentric circles in this shape make your brain perceive them to be moving, but if you stare at one spot they stop. The bright colors are arranged in a way that when we see them, our brain fills in the gaps and "moves" them.
Spinning Dancer Illusion
http://f.tqn.com/y/psychology/1/L/Z/5/Spinning_Dancer.gif
As the dancer spins, some people see her moving clockwise and some people see her moving anti-clockwise. We can attribute this illusion to visual spatial ability, which allows us to construct 2D and 3D pictures in our minds.
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