We study a classical invariant of knots, the Alexander module, via its Pontrjagin dual. This is an algebraic dynamical system, a compact group with an action by automorphisms. It has an elementary combinatorial description in terms of ``dynamic" colourings of a knot diagram. We will discuss the relation between topology of the knot and dynamics of the dual, and give examples. (This is joint work with Daniel Silver.) NOTE that this talk is on Thursday 24th, as Friday is Anzac Day.