Moore (2,1) automata
The binary 
Moore neighborhood in a plane
contains nine cells, meaning that there are 
or
512 different neighborhoods, yielding an incredible 
different automata. After working with cellular automata for a while one
becomes accustomed to such large numbers, as well as to techniques to reduce them to more
manageable proportions. The vast majority of automata are passed over in the process;
those which remain can be studied more systematically.
Harold V. McIntosh
E-mail:mcintosh@servidor.unam.mx