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This amazing experiment on BBC 4 shows how the brain can be tricked to see black and white in colour.

See black and white in colour-colour
Using an image of Dunstanburgh castle in black and white, it can be viewed in colour after staring at a false colour image.
The sensitivity of the light receptors in your eye adjust to the different colours in the image.
By staring at the dot in the centre of the false colour image for a few seconds, the eye then sees the black and white image in colour for a few seconds.