A single note does not compose a melodious tune; a single color does not form a beautiful pattern; a single flavor does not make a delicious meal; and a single thing has nothing to compare with. (Discourses on Governance of the States)

When silk threads of various colors are woven together, a beautiful piece of embroidery is created. When the five musical notes are properly arranged, a beautiful melody is composed. When the five emotions are forcefully expressed, a beautiful piece of writing is created. This is all too natural and obvious. (Liu Xie: The Literary Mind and the Carving of Dragons)