  In previous works, hexagonal cellular automata (CA) have been studied as a
variation of the famous Game of Life CA, mainly for spiral phenomena
simulations; where the most interesting constructions are related to the
Belousov-Zhabotinsky reaction. In this paper, we analyse a special kind of
hexagonal CA, {\it Spiral rule}. Such automaton shows a non-trivial complex
behaviour related to discrete models of reaction-diffusion chemical media,
dominated by spiral guns which easily emerge from random initial conditions.
The computing capabilities of this automaton are shown by means of logic gates.
These are defined by collisions between mobile localizations. Also, an extended
classification of complex self-localisation patterns is presented, including
some self-organised patterns.
