Can you find the circles in this optical illusion?
Could this be 2017's most confusing optical illusion? Can you find all 16 circles?
This optical illusion has left the internet in quite a spin!
This head-scratching optical illusion will have you debating with friends, family, and colleagues for hours - but once you see it, you won't be able to unsee it.
Can you spot the 16 circles in this box of lines and squares?
There are 16 circles in this image.
Mind-boggling, right?
Take your time, squint your eyes and turn your screen upside down if you have to.
Share this with your friends and see if they can figure it out!