How real are colors?

Color perception between physics, neurobiology and sensibility

Are colors real or just a delusion of our brain? agsandrew / thinkstock
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"I see something you do not see, and that's green!" - this saying from an old children's game is based on the assumption that there is a common perception of colors. Colors are therefore an objective, independent of the viewer reality. Or is color just an illusion that creates our brain?

Is a tree really green - even if nobody sees it? And when we see colors, do we share that experience with others, or does each individual perceive something different? These questions have occupied mankind for thousands of years - and science has given and gives different answers.

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Prof. Dr. Dr. Thomas Fuchs, University of Heidelberg / Ruperto Carola
As of: 26.01.2018