What would it mean to see a new color?

Related: Stare at the dot here for ~1 minute: https://dynomight.net/img/colors/eclipse-(255,0,0)-(0,170,85...

From: https://news.ycombinator.com/item?id=44594808

I question I, sometimes, ask my friends and relatives when discussing the human brain and its limitations is: Imagine a color that you've never seen?

Neat, basically a real life version of Mary's Room

https://youtu.be/mGYmiQkah4o?si=L8JKYQP5JqRjyFEt

I dislike the color hexadecimal code #00FFCC very much and it's not even the real Olo color.