With few exceptions every non-comedic or non-surrealistic movie that tells a story, however fantastical or familiar or outlandish or brilliant or self-subverting or satirical, sticks to or "lives in" its own self-regulated realm. The laws and limits of this realm are described in the "Dramatic Integrity Rulebook", which is published and updated every year (usually in late March or early April). All the guilds have been signatories for decades.