Manipulate the vertical lines to find out which line is longer.
The size of your plate can make it seem like you have more or less food than is actually there. Below is an interactive that allows you to explore this concept.
You recently hired a bricklayer to make you a wall from black and white bricks. The bricklayer claims to have installed all of the bricks perfectly straight and that all the bricks were the same size. Drag the red lines between the black and white bricks to see if they are angled or straight.
Discover what optical illusions are and how they demonstrate the role of the brain in vision.
Learn how a middle school student applied the technological design process to invent a device that strengthens eye muscles and prevents eyestrain.
Learn how some vision problems can be corrected by surgery performed with lasers.