This is how people talk about how ancient greeks viewed blue, except we actually can't see this color normally.
https://www.deadlanguagesociety.com/p/history-english-colour...
> It’s not that people in the past couldn’t see blue. Indeed, there were several words which could refer to things we would call blue today, but these words could also describe things we’d assign to other colours too, especially grey and green.
The stuff about ancient Greeks not seeing blue is absolute internet balderdash.
https://www.deadlanguagesociety.com/p/history-english-colour...
> It’s not that people in the past couldn’t see blue. Indeed, there were several words which could refer to things we would call blue today, but these words could also describe things we’d assign to other colours too, especially grey and green.