There is rumor about ancient people, that they could not tell color blue.
Lazarus Geiger followed Gladstone, in his study of Greek myths, Icelandic sagas, the Koran, ancient Chinese stories, Hebrew Bible, and Hindu Vedic hymns. He wrote there was no way to learn from the ancient texts that the sky was blue. There was no blue — says the ■→Business Insider.
The sky and the planet look blue owing to the Earth’s atmosphere, oxygen and water content, without which humans would never have been able to breathe and live. There had to be blue. Blue, Black, Green & White are about the colors, but do not name them.