There are several fun ways to check if your eyes always tell the truth… or are sometimes prone to cheating. Рrint out (or just open the PDF file) these activities and use a ruler to check the answers. You will surely be surprised.
We only see the objects after the brain has processed the information it received from the eyes. This happens very quickly and we normally wouldn’t notice it. Sometimes, however, our eyes can cheat the brain and we get the wrong visual impression. These visual tricks are called optical illusions.