LitCharts assigns a color and icon to each theme in Nausea, which you can use to track the themes throughout the work.
Existence vs. Essence
Time
Love and Sexuality
Art and Legacy
Summary
Analysis
Roquentin records a very short entry: “Nothing. Existed.”
This entry is open for interpretation: did Roquentin do nothing today, or did nothing worthy of continued “existence” in the journal entry happen? Perhaps Roquentin is struggling again with intense derealization.