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I discovered what can show you the colors when it is impossible
He used coloured filters to reduce the intensity of the light from both sunlight and lamps. While doing so he noticed an unusual result -- placing a red filter over a light source would give rise cyan shadows. If he isolated the shadow by viewing it through a small tube, the shadow would appear neutral in colour.The cyan shadow was a product of our brain, it did not exist in reality.[attachment=12013]
Well, there are stories that he ripped off a lot of ideas from his associates without giving them any credit.