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A person with Daltonism cannot differentiate colours which most people can.
Here is my question : how can we make sure that the colours that we normally see are the same for everyone. How can we be sure that what we all call "blue" is really seen the same way by two distinct human beings? Is there any evidence to prove so?What do you think?
Of course, the three colours of the TV/computer screen are the same as the colour receptors