From the cigar nestled in the brickwork to 'The Dress', many optical illusions ... boggling yet. The illusion has gone viral across social media, and feaures two cartoon faces.

The smiling face can be spotted on the left side of the picture. It’s a guy with a green t-shirt. That was tough to spot. If you loved this optical illusion challenge, remember to try out some ...

The video reads: "Did you know that there are two faces in this image? This optical illusion is quite hard to see taking some people up to 10 minutes to see the second face." Giving a clue ...

In this optical illusion test, your goal is to spot four hidden faces in a painting—but here’s the twist: you have only 5 seconds. Let’s put your IQ to the test with this fun and mind ...

Scientists study optical illusions to learn how the visual ... Explain your answers. Do you see two faces or a vase? Does one line look longer than the other? Do the long lines look parallel?