Despite his mother beckoning him to come towards her, this infant hesitates to cross the "visual cliff" – an apparently steep drop that is actually covered by transparent glass. Psychologists in the 1960s found that most infants 6 to 14 months of age were reluctant to crawl over the cliff, suggesting they had the ability to perceive depth. Most psychologists believe that the ability to perceive depth is partly innate and partly a product of early visual experience.

Here's a test you can try to demonstrate how your perception of depth is still live and active. Below are two perfect circles, yet the smaller circle appears distorted. Our brain interprets the converging lines to be adding depth to the screen, as if the solid middle is further aw ...

Can you spot the cat amongst the pigeons? This is Hungarian artist's - Dudolf - latest optical illusion that has some several viewers puzzled. The cause of all this difficulty is likely to have something to do with the way in which the brain processes visual information, by identifying repeating patterns and then using this to automatically fill in the gaps in peripheral vision. This makes it very difficult to spot minor details or irregularities in our visual field without focusing directly on these elements, which means you probably won't see the cat unless you stare straight at it.
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This video offers up one of the strongest natural hallucinatory illusions we've ever experienced.

"We don't live in a world of reality but a world of perception." Try to read every letter on the screen...

The vortex is a spherical field of force, or a magnetic disturbance. The vortex is 165 feet in diameter and sits half way above ground and half below. The disturbance, or vortex causes unexplainable changes in perception, causing naturally occurring visual and perceptual phenomena that has been caught on film many times. Within the spherical distortion, people stand at an angle. The disturbance alters your relative gravity, causing you to stand at an angle of varying degrees. It is not possible for someone to stand vertical inside the vortex. It will also make someone who is walking away, seem taller, or shorter depending on where you stand. Balls roll uphill, brooms stand straight up and down on their own, and chairs appear to be held up b ...

Ever seen 'memory metal' in action? Watch this paperclip - made from an incredible shape-shifting metal called Nitinol - be bent completely out of shape and then restored instantly as it touches a simple bowl of warm water.

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The Schiller Effect (aventurescence) is an optical illusion that makes stones such as labradorite appear to light up internally. The layering of different minerals at a scale near the wavelength of light causes the scattering and interference effect.

Block A is the same colour as block B -- proof shown below...


I removed all the blocks surrounding A and B, and here's what was found