I agree with Catalina that social hierarchy in Japan is a good topic for student to learn about societies in different countries. It would be interesting for students to compare social hierarchies in the U.S. vs in Japan. Similar to Japan, China has social hierarchies of rulers, officials and poor people. In ancient China, the social status was reflected in people's clothing and personal decorations like hair pieces, colors of a robe, etc. Classes were divided and lower class people were expected to behave in certain ways. They would be penalized if they break social rules. "Everyone is equal and has a chance" is ideal in modern societies. We all should do our part to promote equal rights among all human beings.