Letters ride round a clock that needs two laps, 720°, to come home. Type each letter as it crosses the strike line at the top. A first-lap letter (cyan) is worth +1, a second-lap letter (magenta) is worth −1 if missed. Your score is a balance: keep it near zero by catching what you can. The phrase is from SaPpH{{i}}on. Timing windows: perfect ±60 ms, good ±150 ms.
MODEL the 720° clock is Dave's; ANALOGY spinor phase as rhythm. Self-check: the beat grid is exact (each note on a 16th at the chosen tempo) and every note is judged once. ← SaPpH{{i}}on