Workshop by Pirouz Nourian - examples:
Curvature
Analysis (Curves): http://www.parametricmodel.com/CurvatureAnalysis/80.html
Mobius Strip: http://www.parametricmodel.com/Mbiusstrip/69.html
Mobius Strip: http://www.parametricmodel.com/Mbiusstrip/69.html
Surface
Curvature: http://www.parametricmodel.com/IsoSrfCurvature/51.html
Mesh quads: http://www.parametricmodel.com/MeshQuadSrf/49.html
Mesh quads: http://www.parametricmodel.com/MeshQuadSrf/49.html