#projector  an optical instrument that projects an enlarged image onto a screen
  supertype:  #optical_instrument__opticalinstrument  an instrument designed to aid vision
  subtype:  #epidiascope  a projector for images for both transparent and opaque objects
  subtype:  #movie_projector__cine_projector__film_projector  projects successive frames from a reel of film to create moving pictures
     subtype:  #bioscope  a kind of early movie projector
  subtype:  #overhead_projector  a projector operated by a speaker; projects the image over the speaker's head
  subtype:  #slide_projector__slideprojector  projector that projects an enlarged image of a slide onto a screen
     subtype:  #magic_lantern__magiclantern  an early form of slide projector

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