Mushroom Life

Mushrooms follow these rules:
For each generation,
a mushroom with 1 or 0 neighbor dies (loneliness),
a mushroom with 4 or more neighbors dies (overcrowding),
a mushroom with 2 or 3 neighbors survives (stability),
an empty space with 3 neighbors sprouts a new mushroom (birth).

http://a.parsons.edu/%7Ejoseph/k2/gameoflife/