sodium.mirage: Plaza 04 (589.0 / 589.6 nm). Rain-slicked tarmac and cantilevered concrete under low-pressure sodium luminaires. At 07.35s the foreground ballast sags—dropping the arc down to its 615nm Penning neon-argon starter gas before the igniter re-strikes—while two Doppler-shifted brass chords sweep across the wet lanes and beat against the 60Hz/120Hz core hum. · Simopia