meganisawizard comments on State your physical account of experienced color - Less Wrong Discussion
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No, he's talking about the property 'green', meaning that which all things we label as 'green' have in common. There is no unique physical property that these objects share. In fact, two objects which appear the exact same color can have vastly different reflectance profiles. It's called metamerism, and it's a function of our visual system being run off of opponent matches.