For me it's the orthogonality - sometimes I hit some weird thing that's really tricky to do, or surprising, but mostly, solvespace gives you a very elegant set

For me it's the orthogonality - sometimes I hit some weird thing that's really tricky to do, or surprising, but mostly, solvespace gives you a very elegant set of tools for building shapes. That means that instead of stopping every five minutes to fiddle with all the little switches and toggles on some inane popup window you're in a flow state a lot of the time. It's like geometry, where you build complex forms through a straight edge and compass. For this reason, I think that even if solvespace was completely abandoned tomorrow, it would still be of interest to future programmers making future CAD programs.