The underlying form

"We are at the classic-romantic barrier now, where on one side we see a cycle as it appears immediately - and this is an important way of seeing it - and where on the other side we can begin to see it as a mechanic does in terms of underlying form - and this is an important way of seeing things too. These tools for example - this wrench - has a certain romantic beauty to it, but its purpose is always purely classical. It's designed to change the underlying form of the machine."

Robert Pirsig - Zen and the Art of Motorcycle Maintenance