People have been left scratching their heads after seeing a black and white image of a horse transform into colour in front of their eyes - but they don't understand how it works

An optical illusion has left people gobsmacked as it tricks their brains into seeing a black and white image in full colour - providing you do one essential thing. Sharing the illusion, Dean Jackson, who is known on social media as @beatonthebeeb, shared a black and white image of a horse surrounded by sunflowers and paving stones.

He claims the illusion only works on those who focus in on the horse's eye throughout his one-minute explanation, sharing how you'll see the image turn from black and white to full colour due to "retinal fatigue". During the clip, he superimposes the picture to show "psychedelic c

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