Modal Jam Theory
When the plain symmetry of the tritone interval is intentionally avoided... the spiral symmetry of the golden ratio (and its reciprocal) is revealed as the catalyst for modulation.
'Fa' can be heard (as a melodic tone) within all the modes - except one: Lydian. We can hear Lydian by identifying just one other tone: 'Fi' (measured from the root of any chord).
The following articles of 'The Lydian Reflection' will add unique elements and ideas to our current model of the Circle Of Fifths...