this is not music
 • You will hear a pair of sounds. Pick which sound is deeper, shorter, brighter,
  etc. • Click anywhere on the screen to hear the two sounds again.

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book one: on universals and particulars, on categories, and on structural program
Structural Repetition I
 Surface Repetition
book two: on sameness and similarities, on repetition and reappearances, and on types and typographies
Structural Repetition II
 Assocation and Deduction