Optical Illusions

A common feature of optical illusions is having an illusion created by color. This especially deals with the tone of a color, whether it is darker or lighter.

Two optical illusions I found especially interesting were these ones:



The image on the left is created by a technique called dither. This is created when the dots spread apart from each other, so while the smaller image looks as though it has a different pattern and color choice than the large diamond, it actually is the same. The dots in th upper image are just spread out more.

The second image is similarly deceitful. Point B may look as though it is a darker square, but it actually is the same color as square A. The squares around square B are darker, making square b to appear lighter than square A.