The grouping nodes beneath Art Forms, Artists, Works, Movements and Artistic Techniques that divide each type into browsable sections, such as Painters under Artists or Baroque, Rococo and Classicism under Movements. Where this grouping comes from: each subcategory entity's Name matches the SubLabel every member of that group carries. What it deliberately excludes: the sub groups nested one level deeper, which have no page or entity of their own and exist only as a label on the parent subcategory's member entities.