To try the illusion roll your mouse over the image of Salty. Stare at his face for about 30 seconds. Then, roll away your mouse while keeping your focus on his face.

Some browsers block the second image as this uses a Javascript.

Scroll down to see another version

You need to stare at this one for quite a while. And keep staring at the same spot on the image.

Click the image to link to the “real” version.