If you want to have a go at creating your own illusion, take a look at our guide on how to download Photoshop so you have the tools to make your op art or check ... illusion, a ball that appears ...

An curved arrow pointing right. Kevin Parry created a simple, yet maddening optical illusion: he made it look like he was playing catch with himself. He wouldn't reveal how he pulled this off ...

"Find the ball" is the challenge given by the illusion to the audience to locate the object in Granny's living room. This image of an optical illusion shows balls of colorful yarn in Granny's ...