An optical illusions are visually perceived images that differ from objective reality. In other words, its a trick of the eye. Some optical illusions were explained years ago, while others still remain a mystery.
Is this cat going up, or down the staircase?
Is it a frog or a horse?
This is actually a sheet of paper...
...folded in just the right way
Three pretty women?
Now lets flip this image upside down
We rarely encounter upside-down faces, so, when we do, its very difficult to spot any distortion.
Is this window on the right or left of this building?
Are the shades of red and green the same?
It seems as though the squares on the left are darker than the ones on the right. But they are actually the same color.
Upon entering this room, people of average height seem to become either dwarves or giants. It was devised by ophthalmologist Adelbert Ames, Jr. in 1934.
The dynamic luminance-gradient effect
Slowly move your head towards image and the light in the middle will get brighter. Move your head away and the light will become weaker.
These overlapping circles actually dont touch at all