#work_surface  a horizontal surface for supporting objects used in working or playing games
  supertype:  #surface  the outer boundary of an artifact or a material layer constituting or resembling such a boundary; "there is a special cleaner for these surfaces"; "the cloth had a pattern of red dots on a white surface"
  subtype:  #tabletop  the top horizontal work surface of a table
  subtype:  #writing_board__writingboard  work surface consisting of a wide light-weight board that can be placed across the lap and used for writing
     subtype:  #clipboard  a small writing board with a clip at the top for holding papers
     subtype:  #lapboard  writing board used on the lap as a table or desk

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