#illumination  the degree of visibility of your environment
  supertype:  #state  the way something is with respect to its main attributes; "the current state of knowledge"; "his state of health"; "in a weak financial state"
  subtype:  #light.illumination__lighting  having abundant light or illumination: "they played as long as it was light" or "as long as the lighting was good"
  subtype:  #dark__darkness  absence of light or illumination
     subtype:  #night.dark  darkness; "it vanished into the night"
     subtype:  #total_darkness__lightlessness__lightlessnes__blacknes__pitchblacknes__black  total absence of light; "they fumbled around in total darkness"; "in the black of night"
     subtype:  #brownout__blackout__dimout  darkness resulting from the extinction of lights (as in a city invisible to enemy aircraft)
     subtype:  #semidarkness  partial darkness
        subtype:  #cloudiness__overcast  gloomy semidarkness caused by cloud cover
        subtype:  #dusk__twilight  a state of diffused or dim illumination
        subtype:  #shadiness__shadines__shadowiness__shadowines  relative darkness caused by light rays being intercepted by an opaque body
           subtype:  #shadow  shade within clear boundaries
              subtype:  #umbra  a region of complete shadow resulting from total obstruction of light
              subtype:  #penumbra  a fringe region of partial shadow around an umbra
        subtype:  #duskiness__duskines__dimnes  the state of being poorly illuminated
        subtype:  #sombreness__gloom__somberness  a state of partial or total darkness; "he struck a match to dispell the gloom"
        subtype:  #obscurity.semidarkness__obscureness  the state of being indistinct or indefinite for lack of adequate illumination

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