This trippy GIF reveals patterns each time you blink

Take a quick tour of how your brain processes patterns by blinking at different speeds while looking at this GIF. You'll probably see concentric circles appearing in different places, and possibly pentagonal lines now and then.

As I have covered previously, researchers believe many kinds of drug-induced hallucinatory patterns are caused by the hexagonal shape of structures in the primary visual cortex, so it's interesting to see a similar effect with pentagons.