The Secret Life of the Brain
History of the Brain 3-D Brain Anatomy Mind Illusions Scanning the Brain The Episodes:

Mind Illusions
Movement Color Angles Form
Color Study

The orange bricks look darker with a black background and lighter when the white background is applied. With a slight change in the pattern, this illusion goes from one of color contrast to color assimilation - the complete opposite effect. Contrast and assimilation are what enable us to see millions of colors in a world with only 400 wavelengths of visible light.
The human mind can recognize about 7.5 million different colors!

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