Wood behaves the way it does because every board carries the memory of the tree it came from. Leaning trunks, shifting riverbanks, floodwater, wind pressure, scars, tension wood, compression wood — all of it becomes grain, movement, and character in the shop. This piece explains how trees grow, adapt, and survive, and why those hidden forces show up decades later when a woodworker planes a board and the wood reacts. Understanding wood begins with understanding the life it lived.