Two years ago i shared this website where you try and determine when a shade is either blue or green.
Posting it again because lemmy has grown quite a bit since then, maybe we have more people that havent tried it!
That what I have always wondered. Is there a easy to tell if all of our brains perceive the same colours? Maybe whatever I see as "blue" (~400nm) someone else sees as what I would call "yellow" but all they have ever known to call it was blue. Same wavelength but the brain interprets it differently.
We could all have the same favourite colour but just call it different things.