Look real closely at the colors on your computer screen. Don't look up close for too long. It could give you eye strain. Computer monitor colors are optical illusions. It's really little Red, Green and Blue dots all mixed up. Our brains put the RGB together to make all the colors you can see on the screen. Our minds fill in what we believe is there but isn't really. Illusions (not necessarily optical) are commonly used in advertising, politics, etc. to try and persuade one's opinion on a particular subject matter or product. Be conscious of where these illusions are being used and ask yourself why? Take for example the news > especially CNN. Watch it for an hour or two everyday for a short period of time. What good news are they showing? What is the bad news? Is there a theme? What advertisements were made while you were watching? Do you feel if you watched only this channel your viewpoints towards a specific country, group of people, etc. will change? Did you feel slightly fearful when watching it? Do you think it is appropriate for unsupervised children? Optical Illusions below.