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Thank you for your thoughtful comment. The idea of register is indeed a central element in this piece, unfolding through two distinct 'streams' of development. Each stream evolves independently, following its own trajectory for various musical parameters, including register. For each main section, the registral development within each stream follows its own logic-at times unfolding through a series of juxtaposed registral ranges, and at other times through continuous processes of expansion or contraction. A particularly clear example of this approach occurs from 9:23 to the end, where both streams begin in the high register and gradually expand to encompass the full range of the piano.