#plane.shape__sheet  (mathematics) an unbounded two-dimensional shape; "we will refer to the plane of the graph as the X-Y plane"; "any line joining two points on a plane lies wholly on that plane"
  supertype:  #shape__form  the spatial arrangement of something as distinct from its substance; "geometry is the mathematical science of shape"
  subtype:  #facet_plane__facetplane  the plane of a facet of an object (as of a cube)
  subtype:  #midplane__midline  the median plane of the body (or some part of the body)
  subtype:  #orbital_plane__orbitalplane  (astronomy) the plane on which a body is orbiting
  subtype:  #picture_plane__pictureplane  the plane that is in the foreground of a drawing or painting; coextensive with but different from the objective surface of the work
  subtype:  #tangent_plane__tangentplane  the plane that contains all the lines tangent to a specific point on a surface

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