The truth of cinematography* cannot be the truth of the theatre, not the truth of the novel, nor the truth of painting. (What the cinematographer captures with his or her own resources cannot be what the theatre, the novel, painting capture with theirs.
Robert Bresson. Notes on the Cinematographer.
A critical and fundamental film concept that I believe many (filmmakers and viewers) fail to consider and embrace.
* “Cinematography” for Bresson is filmmaking that creatively and thoroughly exploits the very filmic medium. Not to be confused with the work of the cameraman.