The New Jerusalem is terrestrial, the Kingdom of the Father is heavenly. The New Jerusalem represents a hope for the possibility of a world after the end of the world of the first creation. Should it be achieved, the New Jerusalem will be peopled by the remnant mentioned in Scripture. Often in my writing I use the term nothing . But I am ambiguous about this term, as I believe all honest Christian thinkers must be.
Nothing is both something and nothing.
What is there, the thing that is there, the Other that is there at the creation and is instrumental in the Fall, this thing is nothing, and yet it is there. Anywhere one encounters thought or its traces one may sense a sign of God's calling to man and of man's closeness to God. Thus it is that I sense the miracle of creation far more in an individual utterance, or in a written text, than I do in any of the scenes of outward nature. For me, the vault of the sky is a far lesser miracle than the discourse of two children I overhear by chance in the park. Different readers will answer this question differently.