One of the most fascinating topics to me: why have we all agreed on which colors to label? Who says your green is my green--linguistically, not optically?

Sources:
Coxworth, Ben (2018). "Ancient Egyptian pigment may find use on power-saving roofs." https://newatlas.com/egyptian-blue-pi....

Lasky, Dorothea (2015). "What Is Color in Poetry?" From Poetry Magazine. https://www.poetryfoundation.org/poet...

Lucy, J.A. (2001). "Sapir-Whorf Hypothesis." International Encyclopedia of the Social & Behavioral Sciences. https://www.sciencedirect.com/topics/...

Maps:
https://www.forumancientcoins.com/Anc...
https://indo-european.eu/maps/early-b...