The optical illusion today is designed to find out the number 53, hiding in the group of 23 and 21. Only the sharpest and those with a clear vision, which is just 1 per cent of viewers, can spot it ...

Shared by Brainy Bits Hub, the brain teaser asks you to spot a number hidden behind a black and white pattern. “What Number Do You See,” the puzzle asks. Take a look at the post here ...