《孔子家语·问玉》
用目力测量建造的房屋，也必定会有堂和阶。席位则有上下，车位则有左右，行走则有并行和随行，站立则有队列顺序，这是自古的道理。
目巧之室，则有隩、阼，席则有上下，车则有左右，行则竝随，立则有列序；古之义也。
If you measure and build your house by your eye, there are sure to be halls and steps. If you arrange your seats without distinction of rank, there are sure to be the chief and the secondary. If walking, there are the leaders and the followers; if standing, there are the rows and ranks. This has been the rule from the most ancient times.