The Different-Stream Thing in Itself an Appearance

Schopenhauer's essay on the different-stream thing in itself an appearance. It's literally analogous to looking at the surface of the earth versus being able to, having vision to penetrate into the very depths of what is actually on the inside. And so Nietzsche is saying you can have this experience because we have this example in modern day tragic art in the form of Tristan In his old day.