The paradigm shift from the theistic God to the universal God is paralleled almost perfectly in the Bhagavad-Gita when the personal form of God in Krishna, Arjuna's charioteer, shows Arjuna his universal form with it's myriad eyes, its thousand suns, all the sages, and the holy serpents....birthless, deathless....shining....
If we disregard the fear images at the end of the vision - the bloodthirsty mouths etc. - the Shape of the Infinite God fits almost perfectly the new paradigm which is everyone and everything and more (panentheiistic).
At the end Krishna re-assumes his human form to bring peace back to Arjuna.
God can appear in any form but would seem to assume the form which the individual experiencing the vision will recognize as God.
Inasmuch as the personal form of God is the Father, the universal form of God is the Father of Fathers.