In the clip, an illusion enthusiast presents a brightly coloured snap of the countryside with some houses in the background ... the picture swaps its garish colour scheme for black and white.

The picture is said to trick the brain into filling the blanks with the mind, creating an optimal illusion of solid colours to appear where there are none. 'This is a black and white photograph ...

AT FIRST glance, this photo looks like a normal coloured picture of a group of teenagers - but it is actually an optical illusion as it is black and white. London-based digital artist Stuart ...