Interaction devices
- 3D Mice
 - Spaceballs
 - Eye tracking
 - Video camera and shadows (eg. Krueger's Critter and Videoplace)
 - Voice recognition
 - Biological sensors
 - Gloves
- Hand and gesture tracking
 - Enables natural interaction with objects
 - Can use hand-signs to execute actions
  
 - Full body suits
  
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