“Ice Undecim” is constructed around two numbers significant to the formation of the hydrogen-ordered form of ice, known as "Ice XI" — first, 3.4 (the hydrogen bonding ratio of water); second, 0.931 (the density of ice relative to the density of water). The work's "cantus firmus" or “fixed voice-part” is a recording of ice being melted by hot water. The composition as a whole is structured by a stretto of 11 diminuted iterations of this cantus firmus all arranged such that statement X_n begins 93.1% along the way towards the total duration of statement X_n-1. These cantus firmus statements are collectively ornamented by two other sonic phenomena — first, a series of guitar harmonics (specifically 10; that is, 2 on each of the five strings other than the fundamental of a guitar tuned to C# = 136.1 Hz, all of which are retrograded and processed through various analog and digital effects); and second, a synthesized drone, the pitch-structure of which is governed by frequency ratios that begin by expanding gradually to X*3.4 and its reciprocal - i.e. X*(1/3.4) - before ultimately expanding more rapidly to the double octave (4:1, also the bonding ratio of hydrogen in ice).