User:Boris Tsirelson/Sandbox1

• Line: a length without breadth or thickness
  • Length: linear extent in space
    • Linear: along a line↑
    • Extent: a range of locations
      • Location: point or extent↑ in space
    • Space: unlimited expanse in which everything is located↑

• Line: the trace of a moving point
  • Trace: a visible mark left by the passage
  • Move: change location↑
  • Point: a geometric element that has position but no extension↑
    • Position: portion of space↑ occupied
      • Portion: part
        • Part: portion↑
      • Occupy: fill
        • Fill: occupy↑