I read it and understood it, I just don't think polyrhythmics explain time signatures. I can see how you get what your saying, but what part of a time signature does it explain??? Fitting a 5/4 measure to a 7/8 is possible by expanding the duration of notes into polyrhythmics so it fits within a 7/8 measure. I get that. But again that's just rhythm or the duration of notes in a 7/8 T.S. Time Signatures are a completely different perspective of music, they indicate feel. Rhythm is just the duration of notes, same with polyrhythmics. They don't explain each other, that's all I'm saying. Althought the concept your saying is rather kool.