The world is full of optical illusions and things aren’t always the way they appear. Although our mind is constantly trying to make sense of the world around us it can sometimes get a little out of control and make us start to see things…literally. While, some of the optical illusions on our list are relatively famous, others are a bit more obscure but all of them give us a glimpse into our amazingly complex minds. There is no magic involved, no strings attached, its all in your head. Here are the most incredible optical illusions you will find.
The Jastrow illusion.
Discovered by American psychologist Joseph Jastrow in 1891, the illusion works because the shorter side of the top arch (its bottom) is brought into contrast with the longer side of the bottom arch (its top).
Professor Michael Bach, from the University Medical Center Freiburg, explainst hat this happens because we ‘cannot avoid taking into account the lengths of the lines by which the areas are limited’.
If you stare at the dot in the center and move your head away from the screen the rings will start to rotate. Now gradually get closer again…they change direction!
This is a classic optical illusion named after Ludimar Hermann who discovered it in 1870. At every point where the white lines intersect our eyes perceive a gray, shadowy blob. If you look directly at one of the intersections though, the blob disappears.
Stare at the image for about half a minute without moving your eyes and watch as it gradually disappears. This is a variation of Troxler’s effect which essentially says that if you fixate your eyes on a certain point, stimuli near that point will gradually fade.
4. Kanizsa Triangle
The Kanizsa Triangle was named after the psychologist Gaetano Kanizsa who first described its effect. When you look at the image your brain creates contours (outlines) of a triangle although none exist. In reality it is an illusion created by the the wedges and the angles.
This is one of the most famous optical illusion pictures of an impossible object. It has two rectangular prongs at one end that morph into three cylindrical prongs at the other.
6. Monster Illusion
Found in virtually every psychology textbook in the world, the two monsters in this optical illusion are in fact the same size. Your brain automatically adjusts images that it perceives to be distant in order to compensate for the fact that they are larger than they seem.
7. Spiral or Circle
First described by British psychologist James Fraser in 1908, this illusion is also known as the “false spiral”. While it appears that the overlapping arcs are spiraling into infinity they are in fact only a series of concentric circles.
8.Scintillating Grid (black dot ?)
9.Blue Vs GreeN
This is a variation of the Hermann Grid where black dots appear and disappear at the intersections of the gray lines. Interestingly enough, if you cock your head at a 45 degree angle the effect is reduced (but not eliminated).
There are several variations to this optical illusion but the effect is the same. The “blue” and “green” backgrounds are in fact the same color (open it in photoshop or cover it with paper).