Distortion Illusions are ones where what we see appears distorted because of the relative placements of colours and contours
How many spirals are pictured above?
This series of illusion illustrates how shading, perspective, colour and relative objects can distort what our eyes see.
Which is longer, A or B ?
What is odd about the converging lines accross the image?
How many wavy red lines are there?
Squares? or distorded square?
Are the 4 lines above bent or straight?
Do these lines converge?
Which of the yellow lines is shortest?
Also see the Rock illusion