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An aura field was a visual projection used to by drones to convey mood. They were in use by Culture drones at least a thousand years before the Idiran-Culture War.[1]


Moods were indicated by the colouration of the field.[2] The field could also display text.[3]

Colour Mood
Magenta Busy[4]
White Angry[5]


  1. Consider Phlebas, State of play: one
  2. Use of Weapons, Chapter 1
  3. Use of Weapons, Chapter 3
  4. Look to Windward, chapter 1
  5. Surface Detail, chapter 12