#shelf  a support that consists of a horizontal surface for holding objects
  supertype:  #support.device  any device that bears the weight of another thing; "there was no place to attach supports for a shelf"
  part of:  #bookcase  #buffet.article_of_furniture  #cabinet  #chest_of_drawers  #closet  #etagere  #grocery_store
  subtype:  #bookshelf  a shelf on which to keep books
  subtype:  #hob  a shelf beside an open fire where something can be kept warm
  subtype:  #mantel__mantelpiece__mantle__mantlepiece__chimneypiece  shelf that projects from wall above fireplace; "in England they call a mantel a chimneypiece"
  subtype:  #overmantel  a shelf over a mantelpiece

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