A human observer is a person who engages in observation by watching things.


Perception of colour
  • The perception of colour is a very subjective experience.
  • One factor that determines the particular colour an observer sees is the colour of nearby objects.
  • Another factor is to do with the well-being of an observer. Health, medications, mood, emotions or fatigue can all affect the eye, vision and perception.
  • A further factor is the environment in which colours are observed, the type of object and colour associations.
  • Two different observers may see colour differently because of their different life-experience including educational, social and cultural factors.
  • The term observer has distinct and different meanings within the fields of special relativity, general relativity, quantum mechanics, thermodynamics and information theory.