Cat goes ape for this 2-D optical illusion

Humans aren't the only animals affected by trippy optical illusions, as Ryan Kotzin (aka TheRealSquirrelWhisperer) demonstrates. It's interested to see his cat's eyes move around the page as the effect appears elsewhere.

Bonus video: how Ryan earned the name squirrel whisperer:

Cat mesmerized by optical illusion (YouTube / Ryan Kotzin)