[seqfan] Resonance diagram?

[Kerry Mitchell]

Hi all,

I was looking at the Wikipedia article on the Farey sequence:

https://en.wikipedia.org/wiki/Farey_sequence

Toward the end, there's a discussion of the relationship between the Farey
sequence and Ford circles, and a resonance diagram is used to illustrate
the point. What is a resonance diagram in this context? How is it created?
My quick Google search did not reveal anything useful.

Thanks,
Kerry