A tiny group of people can see ‘invisible’ colours that no-one else can perceive, discovers David Robson. How do they do it?As Concetta Antico took her pupils to the park for an art lesson, she would often question them about the many shades she saw flashing before her eyes.
https://www.bbc.com/future/article/20140905-the-women-with-super-human-vision
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