What is meant when we say, "Go down to the potter's house"? Let me explain through these illustrations.

A young mechanic was doing his studies about engine repair. He was in the final stages and was discussing with his instructor what he felt was the most important thing he needed to learn to master the engine. He told his instructor that he had read all of the relevant material on the internal combustion engine, the rotary engine, and turbochargers. He stated that he knew that the engine has nine systems, just like the human body: the oil system, the cooling system, the fuel system, the exhaust system, the electrical system, the drive train system, the steering system, the suspension system, and the braking system. He told his instructor that, if needed, he could enumerate the laws of the…