Didigm is a reflective cellular automaton: the transition rules for the automaton are defined by forms in the very playfield governed by those transition rules.
Sample Configuration
3333333333333
3002300230073
3111311132113
3311321131573
3111311131333
3333333333333
=F3
,
=F1
111111111111111
111111131111111
111111111111574
111111111111333
311111111111023
111111111111113