What is this place?  It is the original Collection of Odd. The oldest, and largest e-collection of illusions has tons of optical tricks, brain dazzlers, mind ...

Two yellow rectangles of equal size are placed over a set of railway tracks. Our sense of 'rightness' tells us that the top rectangle should appear smaller, ...

Named after Johann Poggendorf who first described the effect in 1860. The setup for this illusion is a straight line that passes behind a rectangle. This ...

An Optical Distortion of Cosmic Proportions A galaxy-sized distortion illusion has been discovered in the area of the constellation Fornax (the ...

 This is so cool. A constantly rotating blue square is partially blocked by four red squares.The blue square appears to grow and shrink as it turns. Shrink the ...

A rotating blue square is partially hidden by four red squares. The blue square appears to grow and shrink as it turns. Shrink the red squares by dragging ...

This illusion shows our inability to accurately compare shapes. The two cards are exactly the same size and shape yet the card on the left looks bigger.Drag ...

It is difficult to believe this illusion even after learning the secret. The brown tile in the center of the top face, and the brown tile in the center of the ...

It is easy to find the two aspects of this ambiguous figure. It is either a duck facing left or a rabbit facing right. Once you have realized both aspects, ...

Perhaps the most famous of the ambiguous figurative illusions. Cartoonist W.E. Hill created this drawing with two subtle aspects. If you look carefully, you'll ...

The colors on this US Flag are all wrong. To put the red, white and blue back into the stars and stripes, look directly at the false-color flag for 15 seconds. ...

Who Could This Be? To find out, look directly at the four tiny white dots in the center of the image for about 20-seconds. Count to yourself, or use the ...