Literature Reference: 八牖晨披，五精朝奠。—— 《郊庙歌辞 明堂乐章 雍和》 At dawn, the eight windows are opened, and the five essences are offered in the morning ceremony. Source from 'Jiao Miao Ge Ci Ming Tang Yue Zhang Yong He'.
八: Numbers, the eight directions, the eight extremities.
牖: Window, and the world beyond it.
Meaning: The eight windows symbolize light and wisdom, representing the openness and clarity of the mind.