Optical illusion challenges you to spot 16 circles – and reveals clever way brain works
![Optical illusion challenges you to spot 16 circles – and reveals clever way brain works](https://i2-prod.dailystar.co.uk/incoming/article32224964.ece/ALTERNATES/s615/0_Young-man-getting-frustrated-over-laptop.jpg)
The Coffer Illusion has been going viral on social media with people sharing their thoughts on the puzzle, and it's pretty hard to solve – can you work it out?
The Coffer Illusion has been going viral on social media with people sharing their thoughts on the puzzle, and it's pretty hard to solve – can you work it out?