  To understand the underlying principles of self-organisation and computation
in cellular automata, it would be helpful to find the simplest form of the
essential ingredients, glider-guns and eaters, because then the dynamics would
be easier to interpret. Such minimal components emerge spontaneously in the
newly discovered Sayab-rule, a binary 2D cellular automaton with a Moore
neighborhood and isotropic dynamics. The Sayab-rule has the smallest glider-gun
reported to date, consisting of just four live cells at its minimal phases. We
show that the Sayab-rule can implement complex dynamical interactions and the
gates required for logical universality.
