Five Elements and Yin–Yang
Yin and Yang and the Five Phases provide a language for balance, change, and relationship.
Yin and Yang
Yin suggests receptive, quiet, cool, shaded, and inward qualities; Yang suggests active, bright, warm, open, and outward qualities. Neither is inherently better. Context determines the balance needed.

Five phases
Wood, Fire, Earth, Metal, and Water describe dynamic qualities and cycles. They may be expressed through form, color, material, direction, season, or activity.

Cycles and balance
The generating and controlling cycles help practitioners compare relationships among the phases. The goal is not equal quantities everywhere, but an arrangement appropriate to the function of a place.