The Colour Blind Man

This is a philosophical thought experiment that I came up with at school.

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Imagine a 'colour blind' person. What we see as green, he sees as red and what we see as red, he sees as green.
Surprisingly, nobody would ever know. Why?
First, to explain, I will invent two new words.

• Gred - The colour we see as red but he sees as green
• Reen - The colour we see as green he sees as red.

Now, imagine this man as a baby. His parent points to a gred object, and teaches him it is red. His parent then points to a reen object, and says it is green. Now, this person calls anything he percieves as green "red", and anything he percieves as red "green".

So, in later life, when he is asked 'What colour is this?' about a reen object, even though he sees it as red, he will call it green. So, from the outside, he would be indistinguishable from a non-colourblind person.

--Thomas