Credo che il cerchio sia già la dimostrazione di ciò che hai detto.
Il cerchio, come parte misurabile, può esistere solo grazie ad un punto detto centro, non misurabile.

I believe the circle is already proof of what you said. The circle, as a measurable part, can exist only thanks to a point called the center, which is not measurable.

I do not know if it is pertinent to the wonderful subject dealt with, I wanted to share a consideration born from the contemplation of the circle and its geometric definition. “The set of points equidistant from a point called the center”. The set of points belong to the realm of the measurable, therefore material. But this set cannot exist without its origin, that is, that Point called the center, which is not measurable and therefore not material. It seems to me almost a mathematical demonstration that matter (the known world) can exist only thanks to non-matter or spirit. Perhaps not in the one but in the zero the true divine nature.

See https://www.cut-the-knot.org/do_you_know/GoldenRatio.shtml.

C is the center of the circle with a radius of length CD, also CE.

With D now known, D is the center of the circle with the same radius length DC, also DF.

You can’t move C and D. They’re the center and circumference of the same circle.

My first construction attempt almost nailed Phi (a few PPM too large.)
Moving C and D even a small amount makes a big difference in the ratio AB/BG

With respect to the phi “magic” of the square and pentagon, see the constructions at https://www.goldennumber.net/geometry/. Not every polygon though up to one with an infinite number of sides relates to phi.