#patency  the openness (lack of obstruction) of a bodily passage or duct
  supertype:  #openness.spatial_arrangement__opennes  without obstructions to passage or view: "the openness of the prairies"
     supertype:  #spatial_arrangement__spatialarrangement__spacing  the property possessed by an array of things that have space between them
        supertype:  #placement.position__arrangement  the spatial property of the way in which something is placed: "the arrangement of the furniture"; "the placement of the chairs"
           supertype:  #spatial_relation__spatialrelation__position__spatial_property__spatialproperty  the spatial property of a place where or way in which something is situated; "the position of the hands on the clock"; "he specified the spatial relations of every piece of furniture on the stage"
              supertype:  #relation  an abstraction belonging to or characteristic of two entities or parts together
                 supertype:  pm#thing_that_can_be_seen_as_a_relation  usable as relation type
                    supertype:  pm#thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                       supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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