Optical Illusions

And it was discovered by accident.

But your brain will think it does.

I am so confused.

This may be the world's oldest optical illusion.

Here's how to make it stop.

What am I looking at?

I promise it's more than just a doormat.

This cafe accidentally served up an optical illusion that's puzzled people for decades.

Only 1% of people can see it.

This optical illusion has me stumped.