Do you see all these red-orange lines parallel/perpendicular to each other? If not see closely, all these lines are perfectly parallel/prependicular ( horizontal and vertical) but due to the background, they dont look so.

In 1939, psychologist William Orbison described the Orbison illusion. The inner square appears to be distorted due to the radiating lines. But actually its a perfect square.

In this illusion, one of the blue lines appear to be shorter than the other one. The left side one seems bigger but actually they both are of exactly the same length.

British psychologist James Fraser was the creator of this illusion in 1908.

AHHH I was just playing roll the dice what happened!!!

This optical illusion was submitted by Trevor.

Wilhelm Wundt, a German psychologist described this illusion in the 19th century. In this illusion, both red lines are parallel to each other but due to the other lines, it may seem that these two red lines are not parallel.

This optical illusion was submitted by Joseph Rose.

Are all the four lines of same size? Many of you might think the horizontal line which makes the top of T is shorted but actually its not. These all are of exactly same length.

Where is that dot? Is it on front or in back?

This optical illusion was submitted by Martina

A perfect picture taken at appropriate angle and position makes it look like a giant is going to crush them all.

This optical illusion was submitted by Mikey.

Have you seen such a small Eiffel Tower? Actually its a photograph taken from a distance with perfect angle and position.

This optical illusion was submitted by Rohan.