An optical illusion (also called a visual illusion) is characterized by visually perceived images that are deceptive or misleading. The information gathered by the eye is processed by the brain to give a percept that does not tally with a physical measurement of the stimulus source. Here is a website that offers more explanation and a bunch more illusions if you wish to continue trying to figure them out! 123opticalillusions.com

Here are a few illusions that will really make you think!