Are you ready to test your eyes and brain? Here’s a fun and tricky optical illusion that will challenge ... the image looks like a messy mix of upside-down Z shapes. But hidden among them ...

Our eyes work thanks to light ... So, light exiting the lens to land on the retina is indeed flipped upside down. But that doesn’t mean the brain is actually flipping the picture “back”.

That's the top left if you've turned the illusion upside down. If you're still struggling, we've included the solution at the bottom to put you out of your misery. Engaging in activities like ...

Are you ready to test your eyes and brain ... Try it now and see how focused you are! This illusion shows many upside-down Z shapes—but somewhere in the mix is a number 2.