《吕氏春秋·纪·仲冬纪》
天子住在北向明堂的中央正室，乘坐黑色的车，车前驾着黑色的马，车上插着黑色绘有龙牧的旗帜，天子穿着黑色的衣服，佩戴着黑色的饰玉。吃的食物是黍米和猪肉，使用的器物宏大而口敛。
天子居玄堂太庙，乘玄辂，驾铁骊，载玄旂，衣黑衣，服玄玉，食黍与彘，其器宏以弇。
The son of Heaven resides in the central chamber of the south-facing Ming Hall. He rides in a black cart drawn by black horses, the cart has a black flag with a dragon shepherd pattern, and the son of Heaven wears black clothing and black jade adornments. He eats millet and pork and uses large-scale utensils with narrow mouths.