2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35475We discuss various features of the dynamical system determined by the flow of null geodesic generators of Cauchy horizons. Several examples with non--trivial (``chaotic'', ``strange attractors'', etc.) global behaviour are constructed. Those examples are relevant to the ``chronology protection conjecture'', and they show that the occurrence of ``fountains'' is {\em not} a generic feature of Cauchy horizons.16 pages, preprint MPA 773, December 93, LatexGeneral Relativity and Quantum Cosmologytext