Some films examining obsession in various ways.
1. Synecdoche, New York - Obsession as text, subtext, and sub-subtext
2. A Zed and Two Noughts - Obsession as subject, execution, and profession
3. Harakiri - Obsession as dignity
4. In the City of Sylvia - Obsession as (spoilers)
5. The Century of the Self - Obsession as identity