#natural_enclosure__naturalenclosure__enclosure  a naturally enclosed space
  supertype:  pm#space (pm)  point or extent in space
  subtype:  #cave  an underground enclosure with access from the surface of the ground or from the sea
     subtype:  #cavern  a large cave or a large chamber in a cave
        subtype:  #Carlsbad_Caverns  a group of caverns in southeastern New Mexico noted for their stalactites and stalagmites
     subtype:  #cove.cave  small or narrow cave in the side of a cliff or mountain
     subtype:  #grotto__grot  a small cave (usually with attractive features)
     subtype:  #Lascaux  a cave in southwestern France that contains Paleolithic paintings
  subtype:  #cavern.natural_enclosure  any large dark enclosed space; "his eyes were dark caverns"
  subtype:  #matrix.natural_enclosure  an enclosure within which something originates or develops (from the Latin for womb)

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