Stare at the image below and slowly move your head toward and away from the screen.
Look at the red lines, do they appear to be wavy? 
Spider Effect
These lines are straight although they donot appear so
Is the shape below a perfect square?
Partially close your eyes and then try to read
Dot Illusion, stare the dot in the centre of the picture.
Scroll this page up and down and watch the center square magically move.
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