An optical illusion has left people stunned as it tricks their brains into seeing a black and white image in full colour - but only if you do one essential thing Did you see the picture in colour? (stock) (Image: Getty Images)

An optical illusion has left viewers absolutely stunned as it tricks their minds into perceiving a black and white image in vivid colour - but only if you carry out one crucial step. Posting the illusion, Dean Jackson, recognised on social media as @beatonthebeeb, displayed a black and white picture of a horse amid sunflowers and cobblestones.

He maintains the trick only works for those who concentrate on the horse's eye throughout his one-minute demonstration, explaining how you'll witness the image transform from monochrome to full colour thanks to "r

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