How is the harmonic series like a spiral?

The Next Octave discusses many esoteric aspects of the harmonic series, including how the series can inform our understanding of economics. The book is available at Amazon: https://amzn.to/3cl9S2U

The video mentioned above on the function of the MESE is available here: https://youtu.be/Lt6YiIpjKSw

The explanation regarding how notes are generated (as odd numbers) in the harmonic series is available here, at about 2:30 in: https://www.youtube.com/watch?v=lgLxxm7Vers