This clever image right here is a classic optical illusion that can look different depending on how you view it. Illusions come in several kinds, including physical, physiological and cognitive ones. They show that the brain doesn’t just record what the eyes see. It also makes guesses and fills in gaps, and sometimes those guesses can go either way.

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In this illusion, many people see one face right away and swear the other doesn’t exist, while others flip between the two with ease.

But before you dive into how to see what and what it reveals, take the test yourself first.

Here, this is the image.

So, what did you see first?