The immutables - facts and images
Facts and images that are not subject to interpretation because they are implicitly stated in the script.
Facts are events that happened or circumstances that are true before the scene starts
Events are things that happen in the scene, but once they happen they become facts.
Remember so that facts and events can be immutable, they have to be clear and not open to interpretation. For example: It is evening, or Angel is Mary's son.
You can use immutable facts as stable foundations for your more imaginative ideas about the character.