In Stravinsky’s, Poetics of Music in the Form of Six Lessons he talks about the same issues, but not with words or pictures, but with music.
He describes how when he sits down at the piano to compose, he has total fear and is overwhelmed with an uneasiness of where to begin. Everything and nothing is possible.
It is only after he has picked the key and various other musical constraints, does he begin to feel liberated, and the notes begin to flow more graciously. Freedom comes only from constraint, and from the choices one makes. It is at this point the slow process of exposing the peculiar and real you begins to emerge. As you delve deeper into making decisions, from deciding for and against choices, you find this thing called your voice.
-Rodney Smith