A bearded man in a tunic stood beneath a cloudless blue sky on the hot sand of a beach beside a large sea. All around him were young scholars, also wearing tunics, chattering about the bright sun and the heat it brought. Behind him was a large gray cliff where noisy birds were flying to and from their nests high up on the rock wall. The bearded man asked the students, "Can you describe what you have learned about this beach?" The students quieted and began to look around. One student asked quizzically, "We've just arrived here. What could we have learned? There's nothing here but sand, the birds, the sea, and the sun."