here is my problem, i think "blue" is very much a defined term, and other species will see blue as we do if they have eyes like ours as it is specifically a wave length of light. the rainbow as we know it is no accident. the word might be a definition, but an alien knows that copper turns green like leave on trees because of the properties of light. you can't refute this. its in the very vibrational frequency of light and how it affects particles on a quantum scale.
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