David Novick's Color Illusion Page: Color Constancy Illusions

This page presents color constancy illusions, where shapes that appear to have significant color are really gray (or even the opposite color).

The areas that appear reddish are actually blueish gray.
he areas that appear reddish are actually greenish.
The flowers that appear reddish are actually a blueish gray.
In this detail of the great rose window of the Reims cathedral, the parts that appear dark blue are actually a reddish gray
In this detail of the great rose window of the Reims cathedral, the parts that appear green are actually gray.
Through orange and green filters, in this stained glass panel by Theo van Doesburg the areas that appear blue are actually gray.
Through a green filter, in this stained glass panel by Theo van Doesburg the areas that appear red are actually gray.

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Department of Engineering Education and Leadership | The University of Texas at El Paso
May 18, 2018