Many things can happen between the eye to the brain and back. An optical illusion is something that tricks the mind.

Consider the Muller-Lyer illusion, according to the depth theory, the arrowheads on the ends of the horizontal lines can be seen as angles formed by two intersecting surfaces.

For those who clicked onto this cube illusion, you can see that sometimes the illusion shows six cubes and sometimes it shows seven cubes. This is a very important illusion to me.

Try these out for yourself, read the physical explanation, then try them out on your friends ... Eye Magic Logo: Optical Illusions

On this optical illusion web site you will find the explanation for optical eye illusions and why we see optical illusions.

History of this Illusion ... See "The Perception of Moving Targets" by Robert Sekuler and Eugene Levinson, Scientific American, January 1977, page 60. This article gives a physiological explanation:

Optical Illusions Home > Optical Illusion Gallery > Stacked Bricks Optical Illusion ... See Another Random Optical Illusion ... Get the Explanation for this; Optical Illusion

This optical illusion is a version of the well researched Zöllner's illusion of direction. We don't have a definitive explanation for this. ... Get the Explanation for this; Optical Illusion

There's actually a fairly simple physiological explanation for the phenomenon: neurons get tired. After firing several ... Up until now I haven't said anything at all about this particular illusion.

More than 120 optical illusions with explanations ... The aim of this chapter is to explain you the optical illusion through a gallery of more than 120 geometrical and artistic optical illusions.