Act I — Home Waters: seven historic routes, from backyard Moon loops to the Castle Line. Act II — Blue Water: the deep lines, 1956–2002, each singing in its own microtonal tuning, ending on the oldest route of all.

Two rings close in on a body; tap the instant they meet. Ferry crew out, hit Head Home, bring everyone back to Earth.

Watch your thumbs: stray taps burn fuel — the first slip each loop is forgiven. Fumble with an empty ship and you wobble; fumble with crew aboard and you strand them adrift — catch them on the next pass.

Keys: Space/Enter tap · H head home · M mute