Lefebvre and Régulier ("The Rhythmanalytical Project," in Rhythmanalysis) invite us to imagine a nonmechanical repetition. The invitation presupposes that we already know what mechanical repetition is, but there is nothing transparent or self-evident about the mechanical. *machine is no less an artefact than *language, *question or *rhythm, and in each case we find that anthropos (and then reflexively *anthropos), most especially in the form of a vision of human society, is the measurenaturally even the double measureof the artefact and its other. Here's Lefebvre and Régulier:
For there to be rhythm, there must be repetition in a movement, but not just any repetition. The monotonous return of the same, self-identical, noise no more forms a rhythm than does some moving object on its trajectory, for example a falling stone; though our ears and without doubt our brains tend to introduce a rhythm into every repetition, even completely linear ones. For there to be rhythm, strong times and weak times, which return in accordance with a rule or lawlong and short times, recurring in a recognisable way, stops, silences, blanks, resumptions and intervals in accordance with regularity, must appear in a movement. Rhythm therefore brings with it a differentiated time, a qualified duration. The same can be said of repetitions, ruptures and resumptions. Therefore a measure, but an internal measure, which distinguishes itself strongly though without separating itself from an external measure, with time t (the time of a clock or a metronome) consisting in only a quantitative and homogeneous parameter. In a reciprocal action, the external measure can and must superimpose itself on the internal measure, but they cannot be conflated. They have neither the same beginning, nor the same end or final cause. This double measure enters into the definition and quality of rhythm, irreducible to a simple determination, implying on the contrary complex (dialectical) relations. As such only a non-mechanical movement can have rhythm. . . .
(p. 78, their emphases)
As always I note the resistence to the idea of repetition in its rawest form.