1. Rational Number Class and Continued Fractions I went back and redid a Rational class (again!) and fed it to a continued fractions procedure (I know there's a non-recursive one that's cool -- I think Tim Peters showed me it years ago). Golden Mean = Phi = the fraction: 453973694165307953197296969697410619233826 ------------------------------------------ 280571172992510140037611932413038677189525 (approximately). See link: The pedagogy of "how things work" (Math Forum thread) at my http://www.4dsolutions.net/ocn/cp4e.html 2. Jython + POV-Ray I had occasion to use Jython: the old Qhull algorithm for finding a convex hull has been implemented in Java by John Lloyd. This means I could conflate what had been two programs (Python + Qhull) into one (Jython). Of course I still need POV-Ray to render the results. See link: http://www.4dsolutions.net/ocn/wgraphics4.html * * * The Jython piece will probably feature in my talk at OSCON, which is about how the Open Source community, Python's in particular, has benefited the Design Science community (see talk description for details). Waterman polyhedra have been one of our research topics for some years. Kirby