SurfaceTurtle and CurvatureTurtle by Lorenz Lachauer

Lorenz Lachauer has a great blog called eat-a-bug. It has some very interesting topics. I used his Grasshopper file SurfaceTurtle and Rhino plugin TwistedBeams to generate these plank lines from an ellipsoid:

(The SurfaceTurtle works just like the ToyCar plugin by David Rutten).
I also used his Grasshopper file CurvatureTurtle to generate some elastica curves:

Thanks a lot Lorenz!