#pointed_arch__pointedarch  an arch with a pointed apex
  supertype:  #arch  (architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it
  subtype:  #drop_arch  a blunt pointed arch drawn from two centers within the span
  subtype:  #Gothic_arch  a pointed arch; usually has a joint (instead of a keystone) at the apex
     subtype:  #lancet_arch__lancet  an acutely pointed Gothic arch, like a lance
  subtype:  #ogee_arch__keel_arch  a pointed arch having an S-shape on both sides
  subtype:  #trefoil_arch__trefoilarch  a pointed arch having cusps in the intrados on either side of the apex

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