Prep your brain for a little workout. Can you see 16 circles in this optical illusion that Mashable spotted on Reddit?

The illusion, posted on Imgur and highlighted by a Reddit user called NLS83, includes 16 circles, though at first glance, it looks to be a very linear image made up of just 20 squares.

We promise, it’s possible. Best of luck.

If you love optical illusions, check out this video explaining three common illusions, or try your eyes at this one or this one.

[h/t Mashable]