Visual Illusion

Visual illusions or optical illusions are images that are visually perceived images that differ from objective reality.

http://www.opticaliillusions.com/Optical-Illusion-spinning-spirals.jpg

This image seems as if the edges are moving even though everything in the picture is perfectly still.

http://thecreatorsproject-images.vice.com/content-images/article/do-you-see-marilyn-monroe-or-albert-einstein-in-this-optical-illusion/89ae020999efcdcfad0d576a15c169ec.jpg?1xw:0.2587982832618xh;*,*&resize=1200:*

By focusing and unfocusing on the picture, one can see both Marilyn Monroe and Albert Einstein

http://brainden.com/images/old-couple.jpg

Looking at this picture, one can see an old couple but also a picture of a smaller couple.