Eh...
"They perceived it as green" is a misleading statement. They categorized it as green. They thought of it as green. But then, "green" to them meant something different than it does to you.
Imagine, if you will... a person from... say, Kentucky. You play for them a piece of music. They grimace a little, and say, "That's some of that Metal music folks in California listen to, isn't it?"
And you're like, "Well, this is Death Metal. And this other one is Grindcore. And this is Black Metal, and it comes from Norway..."
And they stare at you blankly. They hear the exact same sounds you do. But they don't recognize them as different sub-genres. They couldn't describe to you how they differ - they have no words to speak about the nuances of style or quality that differentiate them. Their minds are filled with the dominant classification, "Metal" and have no further distinctions.
Or, from math - let us say you work with a person from a culture that does its math in base 8. You have a single word for "nine". They have a compound word for "eight and one", because "nine" is not a separate concept they have. It isn't that they can't add 5 and 4 together, but as a language, they don't count "nine" as a separate concept.