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These are four layered improvisations, one each in all four heptatonic moment-of-symmetry scales available in 23 equal divisions of the octave. 23 is a fascinating system quite unlike the nearby and more familiar quarter-tone system (aka 24-EDO). Harmonically it approximates a wide variety of Just intervals: 12/11, 9/8, 7/6, 6/5, 7/5, 10/7, 11/7, 5/3, 12/7, 16/9, and 11/6, as well as exotic rational intervals like 14/11, 17/14, 19/14, and 21/16. However, it fails to approximate “basic“ consonant
