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 looks blue owing to the Earth’s atmosphere, and humans have never been able to breathe and live without it. There had to be blue. Blue, Black, Green & White are about colors, but do not name them.