#shadiness__shadines__shadowiness__shadowines  relative darkness caused by light rays being intercepted by an opaque body
  supertype:  #semidarkness  partial darkness
  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

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