" A fief, the elder Hosokawa had advised, was like a castle wall built of many rocks. A rock that could not be cut to fit in comfortably with the others would weaken the whole structure, even though the rock itself might be of admirable size and quality. The daimyō of the new age left the unsuitable rocks in the mountains and fields, for there was an abundance of them. The great challenge was to find one great rock that would make an outstanding contribution to one's own wall. "

― Eiji Yoshikawa , Musashi