Half a croissant, on a plate, with a sign in front of it saying '50c'
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monitor projector heating

shine heat directly at people rather than heating a whole room
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have an infra red camera on the ceiling, or in the corner of a room, linked to a computer and one of those monitor projectors, but one modified to shine infra red light instead of red green and blue; and have the projector and camera in roughly the same place, so heating wherever it detected heat,[likely people or animals] or you could get it to blank out some stationary block object such as maybe some electricals
technobadger, May 14 2007

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       This is a good idea, if it can be made practical.
baconbrain, May 14 2007
  

       Damn My face is hot as hell but my ass is freezing!
jhomrighaus, May 14 2007
  

       Time to turn over.
bungston, May 14 2007
  

       Could you make it also recognize faces and personlaize the temperature setting?   

       A possibly convenient way to get rid of undesired guests...
d, May 14 2007
  

       Would work well with microwaves.
nuclear hobo, May 15 2007
  
      
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