Tidal Lock | 52 Minutes | Edge | IronScript 

The body has a tendency to synchronize. Heart rate, breathing, and physical sensation all drift toward the rhythm they're exposed to long enough. Tidal Lock uses that.

The first ten minutes run at a single consistent tempo... full range, metronomic, almost meditative. The timing is precise enough that the body stops anticipating each stroke and starts assuming it. That assumption is the point.

At minute twelve the tempo stays exactly the same but the depth changes without warning. The body is locked to the rhythm and expects full range to arrive on beat. When it doesn't, when the stroke lands shallow, or stops at midpoint, or barely moves at all. The mismatch registers as something between confusion and heightened sensitivity. The nervous system is trying to reconcile two signals that don't agree.

At minute 17 the rhythm shifts. Not dramatically, almost imperceptible. But the body was calibrated to the previous tempo and feels the change as a full disruption. It takes ten more minutes to re-entrain to the new pace.

Then the depth changes again.

Four lock sections. Three dissonance sections. Each lock tightens the tempo. Each dissonance exploits the entrainment the previous lock built. By the final lock at minute forty-five the body is committed to a rhythm it can't exit.

It ends mid-stroke.