Pithoprakta mm. 53-60

ref: Iannis Xenakis, Formalized Music, (Bloomington, Indiana University Press, 1971) 18-21.

The y-axis represents 5 octaves starting from contrabass F, while the x-axis represents measures 53-60 of Xenakis' Pithoprakta.

The straight lines represent the trajectory of plucked glissandi notes. The severity of slope is proportional to the molecular velocities generated according to Boltzmann's Kinetic Gas Theory.