‘A sound must never come to the rescue of an image, nor an image to the rescue of a sound”
“If a sound is the obligatory complement of an image, give preponderance either to the sound, or to the image. If equal, they damage or kill each other, as we say of colours”
-Notes on the cinematographer” from Bresson, R.
It’s such an interesting thing to learn as I always think sound and image are both important equally in every screen.