Perhaps the most iconic use of camera films inside filmography is in the thriller genre. Think of Blow-Up (1966) or more recently Searching (2018). A single roll of 35mm film contains frames that, when enlarged, reveal a murder or a secret. In these narratives, the film stock is a silent witness. The process of developing the film (the chemicals, the darkroom, the enlarger) becomes a suspense sequence. The audience waits with bated breath as the image slowly appears on photographic paper.