The Book of Rites specifies hunding chensheng — settle them at night and pay respects at dawn — and this everyday form is what filial piety mostly consists of in the classical texts. The Analects is notably impatient with the minimal version: asked about filial piety, Confucius says that nowadays it means being able to feed one's parents, but dogs and horses are also fed, so without reverence what is the difference; and elsewhere, that the difficult part is the facial expression. Other requirements include not travelling far while parents live without a stated destination, knowing their ages with both joy and apprehension, and remonstrating gently when they are wrong. The point worth making is that the enormous apparatus of ancestral ritual is secondary in the source texts to the daily treatment of living parents — and that the daily version is precisely what urban migration, working hours and the one-child generation's four-two-one demographic have made structurally difficult across East Asia, which is why elder care is a live political subject in China, Korea and Japan.