The sound begins with a clean struck front edge and a wider sustained body behind it. The pulse is audible, but the recording does not make it feel like a simple metronome. Bright attacks, held resonance, and small accent shifts all arrive together.

By 0:30, the surface is already moving hard while staying smooth. The important sonic fact is the friction: a regular pulse with alternate metric pull around it. The ear can follow the grid, yet the accents keep rubbing against that comfort.

Around 1:00, the texture feels denser without becoming heavy. The attacks remain clear, the sustain behind them grows more important, and the middle of the sound carries more body than the opening. Reich's brightness is not thin here. It is a repeated edge with weight accumulating behind it.

The sound loosens around 2:03 and again near 3:00. Those releases are not empty spaces; they are changes in tension inside the same machinery. The band of sustained tone still holds, the struck surface keeps moving, and the listener hears relief as a shift of density rather than silence.

After 3:51, the sonic field becomes steadier and more charged. Around 4:30, the force starts building again, and near 5:00 the surface has its late push: dense motion, smooth grain, bright attack, and a body that is captured without being comfortable.

The ending is a sonic cut. Around 5:20, the texture thins and the last seconds lose support quickly. The sound does not resolve by changing color. It stops by withdrawing the system that had made small differences feel large.