Yes. Thanks for that. Never heard before but definitely worth listening.
Not exactly a match for this thread’s subject but in case you do not already know - which I doubt - here is my recommendation:
EDIT: Yes. Excellent analysis in the video and surprising resolution.
Xronomorph is a very interesting free software in respect to rhythm:
https://www.dynamictonality.com/xronomorph.htm
“The Geometry of Musical Rhythm” by Godfried Toussaint is a great read. It is strictly concerned with repetitive rhythms and not all rhythmical phenomena.
Thanks for sharing, these look interesting! 
Coincidentally, the work I’m developing (called chronometry) has as one of its building blocks the (poly)chronomorph! The rhythms I employ are all Euclidean however, and the “shape” I ascribe to musical time is pitch information.
Godfried Toussaint is the guy who started writing about euclidean rhythms (as far as I know) so that should be a must-read.
! I am ignorant. Definitely a must-read.
Supercool! Time to have fun with Xronomorph! 
Xronomorph
Let’s get these implemented in Sonic Pi!
Perfect balance - who wants to have a go at this? I think it should be possible just as a Ruby function which would make a very easy first PR for someone. I’m happy to help with the process of getting it merged.
Well formedness I’m not sure I understand this one yet. Again though, it’s probably only a couple of functions to implement.
Any takers?
New euclidean rhythm software and browser option: Releases · hisschemoller/music-pattern-generator · GitHub
But, yes, would be fantastic to have perfect balencend and well formed rhythms in Sonic Pi.