video of illusions with titles

The checker shadow illusion is an optical illusion published by Edward H. Adelson, Professor of Vision Science at MIT in 1995.^[1] The image depicts a checkerboard with light and dark squares. The optical illusion is that the area of the image labelled A appears to be a darker color than the area of the image labelled B. However, they are actually exactly the same color.

This can be proven using the following methods:^[2]

• Opening the illusion in a image editing program and using the eyedropper tool to verify that the colors are the same
• Isolating the squares. Without the surrounding context, the effect of the illusion is dispelled.
• Using a photometer
• 

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