When we open our eyes, a myriad of colors immediately appears before us. But they are not merely a decoration of our visual world: they enable us to identify objects, materials and substances in our environment. They also facilitate communication with other people. Thanks to them, we can tell the difference between a ripe banana and one that is still “green.” Or ask in a shop for the size of the “red” shoes we saw in the window.
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Source: Phys.org