How do you do Euclid's Elements in PyGeo? Can be done, yes?

Yes, and no. PyGeo is really built to explore more modern notions of geometry. Notions of length, area, and to a good extent shape are not invariants in projective space, or non-euclidan space - and so are not of the essence when studying those kinds of geometries. So not a lot is done with those notions in PyGeo - at least in how I use it. Those notions are more significant in Euclian space. Plus, no need to reinvent the wheel: http://aleph0.clarku.edu/~djoyce/java/elements/elements.html has the complete Elements up, with essentially all the constructions as dynamic Java applets. Using the applets are great to explore a construction *after* one has done that construction by hand, IMO. We can get into a whole discussion about the use of technology in education. To the extent it has been scientifically studied, the evidence is that the heavy use of computers in the classroom = a slight detriment to student advancement. No evidence of a major +. I'm believing that it is too easy for someone to slip into passive mode, and out of learning mode - in front of a screen. There is only one way to build a construction in PyGeo. By the deliberate act of writing a script. The mental process is much closer to that of building by hand - then for example it would be using a GUI. And that is how I want it to be. The important thing is that it does things you can't do on a piece of paper. Like simulate the working in 3d space. In that way - by doing something that it is hard or near impossible to do without it - it employs technology for educational purposes. The Euclidian constructions are generally simple enough to do on paper with a ruler and compass. I see no reason, really, to do them any other way. Art