on Jane Friedman site:

A lot needs to be conveyed in a story, from the most superficial ideas to the most profound, and character is the lens through which everything is channeled.

In broad terms, the concept of interiority can be defined as a character’s:

• Thoughts
• Feelings
• Expectations
• Reactions
• Inner struggle

These can be expressed in moments big and small. Interiority can be used to mark character growth and change, as well as scene-level reactions to events.

Generally, information can be deployed at four levels of narrative depth.

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