In the following sentence:
"The movie existed fully on the page"
Does "on the page" mean what it seems to mean: All the movie was already in the screenplay? Or may it be a kind of idiom?
No more context, except for the fact that the sentence is referring to a newcomer director facing his own personal script from a very deep and personal story.
It's hard to tell without more context, but it seems as though the director had a one-page outline of his movie, and worked entirely from it, improvising as he went along. The single page was the entire script.