#stairway__staircase__stairs__steps__step  a way of access consisting of a set of steps
  supertype:  #way  any artifact consisting of a road or path affording passage from one place to another; "he said he was looking for the way out"
  subtype:  #backstairs  #companionway  #escalator  #fire_escape  #flight_of_stairs  #ghat  #ladder
  part of:  #edifice
  part:  #landing.platform  an intermediate platform in a staircase
  part:  #stairhead  platform at the top of a staircase
  part:  #stair__step  support consisting of a place to rest the foot while ascending or descending a stairway; "he paused on the bottom step"
     part:  #riser  structural member consisting of the vertical part of a stair or step
     part:  #tread  structural member consisting of the horizontal part of a stair or step

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