Ratio is the fundamental notion of all activities of reason and proportion.
Ф phi is the primal proportion, but . . .
Ф phi is irrational (without ratio).
Ф phi is farther away from being expressible as a fraction than any other irrational number.
Ф phi cannot be analyzed, because it is illogical and counter-intuitive.
Ф phi cannot be defined, it just is.
Ф phi is not a physical law, it is a metaphysical law.