#line_roulette__roulette  a line generated by a point on one figure rolling around a second figure
  supertype:  #curved_shape__curve  the trace of a point whose direction of motion changes
  subtype:  #cycloid  a line generated by a point on a circle rolling along a straight line
     subtype:  #curate_cycloid  a cycloid generated by a point inside the rolling circle
     subtype:  #prolate_cycloid  a cycloid generated by a point outside the rolling circle
  subtype:  #epicycloid  a line generated by a point on a circle rolling around another circle
     subtype:  #cardioid  an epicycloid in which the rolling circle equals the fixed circle
  subtype:  #hypocycloid  a line generated by a point on a circle that rolls around inside another circle

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