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Is it possible for certain people to perceive colors differently?
Would it matter if people see colors differently as long as the relative difference between all colors is the same? An analogy: Bob hears "cat" every time someone says "dog" and vise versa, but cats and dogs appear as different to each other as any other normal person perceives them.
How long does it take to read a sentence with X number of characters?
I reposted my comment on ux.stackexchange.com before some mod migrated my question to cogsci.