Quality ... you know what it is, yet you don't know what it is. But that's self-contradictory. But some things are better than others, that is, they … - Robert M. Pirsig

I've noticed that people who have never worked with steel have trouble seeing this—that the motorcycle is primarily a mental phenomenon. They associate metal with given shapes—pipes, rods, girders, tools, parts—all of them fixed and inviolable, and think of it as primarily physical. But a person who does machining or foundry work or forge work or welding sees "steel" as having no shape at all. Steel can be any shape you want if you are skilled enough, and any shape but the one you want if you are not.

Plato finds it necessary to separate, for example, "horseness" from "horse" and say that horseness is real and fixed and true and unmoving, while the horse is a mere, unimportant, transitory phenomenon. Horseness is pure Idea. The horse that one sees is a collection of changing Appearances, a horse that can flux and move around all it wants to and even die on the spot without disturbing horseness, which is the Immortal Principle and can go on forever in the path of the Gods of old.

It’s sometimes argued that there’s no real progress; that a civilization that kills multitudes in mass warfare, that pollutes the land and oceans with ever larger quantities of debris, that destroys the dignity of individuals by subjecting them to a forced mechanized existence can hardly be called an advance over the simpler hunting and gathering and agricultural existence of prehistoric times. But this argument, though romantically appealing, doesn’t hold up. The primitive tribes permitted far less individual freedom than does modern society. Ancient wars were committed with far less moral justification than modern ones. A technology that produces debris can find, and is finding, ways of disposing of it without ecological upset. And the schoolbook pictures of primitive man sometimes omit some of the detractions of his primitive life — the pain, the disease, famine, the hard labor needed just to stay alive. From that agony of bare existence to modern life can be soberly described only as upward progress, and the sole agent for this progress is quite clearly reason itself.