Numerology pays attention to metal, wood, water, fire and earth, which are the five elements. The Five Elements Theory believes that the world is composed of the movement and changes of five materials: wood, fire, earth, metal, and water. The five materials are mutually reinforcing and restricting each other, and they move and change in cycles.
"Soil" has the characteristics of fertility and nurturance. People with moderate "earth" have round waists and broad noses, clear eyebrows, good eloquence and loud voices, are loyal, filial and sincere, magnanimous, do what they say, and have results in their actions. People with too much "earth" are inflexible, stupid, introverted and quiet. People with too little "earth" have a melancholic and dull complexion, with a flat face and a slumped nose. They are vicious, surly, untrustworthy, and unreasonable.