A tree is a column under compression. The trunk bears weight through lignified cell walls arranged in concentric cylinders — each ring a year of structural investment. The engineering is elegant: hollow tubes bundled into solid beams, flexible enough to sway in wind, rigid enough to support tons of canopy.

Water travels upward through xylem — dead cells arranged as continuous tubes, driven by the pull of evaporation at leaf surfaces. Sugar flows downward through phloem — living cells passing molecules hand to hand like a bucket brigade. Two plumbing systems, running in parallel, sustaining everything above and below ground.

The root system is a foundation engineered for tension and compression. Tap roots anchor vertically; lateral roots spread horizontally, often extending far beyond the canopy drip line. The engineering challenge: resist wind loads that can exceed 100 km/h while maintaining flexibility. The solution: a distributed foundation that moves with the forces rather than rigidly opposing them.