#polyhedron  a solid figure bounded by plane polygons or faces
  supertype:  #solid.shape  a three-dimensional shape
  subtype:  #convex_polyhedron  a polyhedron any plane section of which is a convex polygon
  subtype:  #concave_polyhedron__concavepolyhedron  a polyhedron some of whose plane sections are concave polygons
  subtype:  #prism  a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms
     subtype:  #parallelepiped__parallelopiped__parallelepipedon__parallelopipedon  a prism whose bases are parallelograms
        subtype:  #cuboid  a rectangular parallelepiped
        subtype:  #rhombohedron  a parallelepiped bounded by six similar faces (either rhombuses or parallelograms)
     subtype:  #quadrangular_prism  a prism whose bases are quadrangles
     subtype:  #triangular_prism  a prism whose bases are triangles
  subtype:  #pyramid.polyhedron  a polyhedron having a polygonal base and triangular sides with a common vertex
  subtype:  #tetrahedron  any polyhedron having four plane faces
  subtype:  #pentahedron  any polyhedron having five plane faces
  subtype:  #hexahedron  any polyhedron having six plane faces
     subtype:  #rhombohedron  a parallelepiped bounded by six similar faces (either rhombuses or parallelograms)
  subtype:  #octahedron  any polyhedron having eight plane faces
  subtype:  #decahedron  any polyhedron having ten plane faces
  subtype:  #dodecahedron  any polyhedron having twelve plane faces
  subtype:  #icosahedron  any polyhedron having twenty plane faces
  subtype:  #regular_polyhedron__regularpolyhedron__regular_convex_solid__regular_convex_polyhedron__Platonic_body__Platonic_solid__ideal_solid__idealsolid  any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent
     subtype:  #regular_tetrahedron__regulartetrahedron  a tetrahedron with four equilateral triangular faces
     subtype:  #cube__regular_hexahedron__regularhexahedron  a hexahedron with six equal squares as faces
        subtype:  #quadrate.cube  a cubelike object
     subtype:  #regular_dodecahedron__regulardodecahedron  a dodecahedron with twelve regular pentagons as faces
     subtype:  #regular_octahedron__regularoctahedron  an octahedron with eight equilateral triangles as faces
     subtype:  #regular_icosahedron__regularicosahedron  an icosahedron with twenty equilateral triangles as faces
  subtype:  #prismatoid  a polyhedron whose vertices all lie in one or the other of two parallel planes; the faces that lie in those planes are the bases of the prismatoid
     subtype:  #prismoid  a prismatoid whose bases are polygons having the same number of sides and whose other faces are trapezoids or parallelograms
  subtype:  #trapezohedron  a polyhedron whose faces are trapeziums

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