"A human body is like a whirlpool; there seems to be a constant form, called the whirlpool, but it functions for the very reason that no water stays in it. The very molecules and atoms of the water are also "whirlpools"-patterns of motion containing no constant and irreducible "stuff." Every person is the form taken by the stream-a marvelous torrent of milk, water, bread, beefsteak, fruit, vegetables, air, light, radiation-all of which are streams in their own turn."