The interesting part is that perception is shaped by language. The Ancient Greeks did not have a word for blue, which led to things like the sky being described as "wine-colored" or "bronze". Similarly, the English "blue" is split into two in Russian: light blue (голубой – goluboy) and deep/dark blue (синий – siniy), a speaker has to choose between them when describing something.

The wavelengths may have always existed but colors only become a thing when we draw the arbitrary lines between them.