Another technique I used to combine rhythmic and harmonic material in The Flowering Desert and TRAPPIST-1 is isorhythm[28].  I generated different taleae using rhythmic units or combinations of them which I linked to a particular idea. For example, to represent the idea of the triple transit, a particular important moment in the discovery of the TRAPPIST-1 system, I combined the rhythmic units of the three planets responsible for this event (planets C, E, and F) into a talea. Similarly, I generated different color using pitch combinations from the harmonic material. Some examples of color are: the order of discovery of the planets (C, G, E, F, B, D, H), the triple transit (C, E, F), or the two planets theorised and spotted months later (D, H). We can consider that the generation of the banks of materials previously discussed is also a form of multi-layered isorhythm, as it combines the unique taleae and color of several independent lines, each of them linked to a planet.

Isorhythm

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