Nice. It's fun the be able to play with the initial "forest fire" model and try to model different conditions -- a wet forest which takes more adjacent sparks t

Nice. It's fun the be able to play with the initial "forest fire" model and try to model different conditions -- a wet forest which takes more adjacent sparks to create a fire, a fire that stays burning longer, etc. A couple small suggestions from someone who makes a lot of these kinds of models: A "Step" button would be really nice, to be able to advance the model a single step at a time; it would be helpful for "Start" to change to "Reset" or "Restart" after the initial press, so you're not surprised when it blows away your model; "Continue" could be disabled until you Stop, as it doesn't do anything.