OSASCOMP (Opinion, Size, Age, Shape, Color, Origin, Material, and Purpose) is a tiny, almost comically specific fragment of a much larger tacit knowledge system—one that governs how people speak, act, and move through the world without ever needing to explain it. For writers, it reveals how invisible rules shape reality.

How fiction writers can use “on background” journalism techniques to improve research, build richer characters, and find emotional truth through better interviews, observation, and attention to what people don’t say.