• Color

• wavelength of light in the visible electromagnetic spectrum (380-750 nm)
• the perceptual dimension that encodes emotion in prism and carries evolutionary survival signals

• the visible spectrum

  • color	wavelength	emotion	arousal
    red	620-750 nm	anger	highest
    orange	590-620 nm	disgust	high
    yellow	570-590 nm	surprise	high
    green	495-570 nm	joy	medium
    blue	450-495 nm	interest	low
    indigo	420-450 nm	sadness	low
    violet	380-420 nm	fear	lowest

• physics

  • color is electromagnetic radiation — oscillating electric and magnetic fields
  • wavelength determines energy: shorter wavelength = higher energy per photon
  • human cone cells: S (short/blue), M (medium/green), L (long/red) — three channels, infinite perception

• biology

  • trichromatic vision evolved in primates for foraging: detecting ripe fruit against green foliage
  • chlorophyll absorbs red and blue, reflects green — the color of life is what photosynthesis rejects
  • color vision is a survival technology: threat detection, food selection, mate assessment, navigation

• in the cybergraph

  • color is the semantic channel between protocol state and human perception
  • see color-emotion spectrum for the full evolutionary theory
  • see emotion for implementation in prism