1) The document summarizes key passages from Jean-Paul Sartre's novel Nausea that explore the concept of "nausea", which the main character Roquentin experiences as a feeling of unease when confronting the bare existence of things.
2) Roquentin has revelations about the subjective nature of reality that lead him to understand "existence precedes essence" - that we exist first and then define ourselves, creating freedom but also anxiety about how to live.
3) The document outlines exercises for students to explore these existential concepts by reflecting on their own experiences with mirrors, internal states, and the feeling of nausea through the lens of consciousness, reason, emotion and practicality.