That’s actually a pretty cool observation. Moss spreads with a lot of local rules—like a cellular automaton—so you can model it with a simple grid and some growth probabilities. If you add fractal‑inspired scaling, you could predict how the coverage expands over time. Once you have a reliable spread model, you could feed in satellite or drone imagery to estimate moss density and, by extension, forest health. It’s a small piece of a larger puzzle, but definitely worth exploring.