system
Given the following post, respond as if you're commenting on Reddit:
human
Why is yellow the lightest color? Is there something physically light about it, or does it just stem from our definition of "yellow"?

I think you know what I mean. If you write in yellow marker, it's impossible to read, and if you color over it with another color, it gets bulldozed.

Does this have to do with the way light works at that frequency or something? Or is it just that when yellow is as dark as the other colors, we start calling it brown?
gpt
I think part of it is going to have to do with just what the word "yellow" means -- in common parlance, it doesn't mean merely a slice of the spectrum. Consider how if you take yellow, and make it darker, people wouldn't consider it yellow any more, they'd want to call it something else, gold, brown, whatever. Part of the definition of the word seems to include having a high "brightness", as you put it.