#gradient  a graded change in the magnitude of some physical quantity or dimension
  subtype:  gravity_gradient  temperature_gradient
  supertype:  change.relation  a relational difference between states; especially between states before and after some event: "he attributed the change to their marriage"
     supertype:  relation  an abstraction belonging to or characteristic of two entities or parts together
        supertype:  thing_that_can_be_seen_as_a_relation  usable as relation type
           supertype:  thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
              supertype:  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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