The first image was made by lifting a spline from KnotPlot and running 
it through Mike Williams' Ropes2.inc file: 
http://www.econym.demon.co.uk/pov/rope.htm

I'm still puzzling over getting the twistiness right so that it lines up 
at the bottom.  Trial and error got me close.

The second is a blob thing made from the 4 edge splines from KnotPlot. 
(See the other knotplot spline post above).

Dave Matthews

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