What followers of this school talk is the name and essence of things, rights and wrongs of cases. In fact, it was the school of logic in ancient times, which boasts typical figures like Gongsun Long, Deng Xi and Hui Shi. Such logicians were famous for being expert at analyzing the “name” and the “essence”. Up till now, their classic dogmas like “White Horse Is not a Horse at All” have been still alive.