Forest Fire Cellular Automaton

A classic model in complex systems used to study self-organized criticality.
Rules:
1. A burning tree (@) becomes an empty space (.).
2. A tree (Y) will burn if at least one neighbor is burning.
3. A tree ignites with a very small probability (lightning).
4. An empty space grows a tree with a small probability.
As trees slowly fill the grid, the system reaches a "critical state" where a single spark can trigger a massive cascading wildfire, demonstrating how ecosystems naturally balance on the edge of instability.