optical illusion?An illusion is often caused by the visual system and it tends to be different for most people.Now an image posted online has caused quite a stir with viewers left scratching their heads.The photo shows a blurry colourful scene which asks fans to "stare at the black dot for 10 seconds".
Since it was shared on Twitter, the post racked up 3,100 likes and hundreds of retweets.So what do you see when you stare at the black dot for a few seconds?Don't forget to leave a comment below the article to share your thoughts!According to the user who posted the optical illusion, the colours will disappear after a while.And if you're wondering how that's happened, don't worry there's an explanation.
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