A phasing canon in C major between two voices. Both vibraphones play the same 8-note Cmaj7 arpeggio (C E G B C G E C) at slightly different tempi: 84 and 84.4 cpm. They start in unison, then drift through one full phase revolution against each other every ~3.5 minutes. As the offset opens up, fresh major-7th consonances bloom between the voices — harmonies emerge from the arithmetic, not from chord changes. [Plus a timeline of what happens at 0:30, 1:00, 2:00, 3:30] Same timbre, same octave, same gain. The brightness comes from the math, not from instrumentation.