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The Sliding Blue-Hue Illusion

A matrix of gray and black bars next to areas of light and dark blue. Are the blue areas two different shades of blue? They really are the same shade.

Any color with black next to it, looks darker. Any color with white next it, looks lighter. Move the slider bar all the way to the left. Do the blue areas look closer to the same shade? Slide the bar all the way to the right. Do the blues areas on top look lighter?

Art: R. Ausbourne; Java Applet: 2001 Tony Azevedo

 

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