Black is a very complex buddha color in Tibetan people's life. Some say black absorbs light, but others say it repels evil spirits. The herdsmen live in black tents woven with black yak hair. Men and women in rural areas wear black Tibetan clothing, especially traditional rural women, they are completely in black. In Tibetan architecture, black window frames must be paired on the white wall, narrow on the top while wide on the bottom, which means "ox horn". It is said this kind of design can bring good luck.