The short version
- “Resonance” ran at Grace Cathedral from June 24 to September 20 and has closed, so what follows is the record of it.
- Fontana captured the hum that bells and organ pipes produce while nobody is playing them, because every resonant object answers vibrations around it at its own pitch.
- The piece turned the cathedral’s acoustics inside out, playing the building’s own passive sound back into its nave through 12 loudspeakers.
Every bell is always ringing, a little. Strike it and you hear its note; leave it alone and it still trembles faintly at that same note whenever something nearby, a bus, a wind gust, a lower bell, shakes the air at a frequency it likes. The ear cannot hear this. A sensor can.
That is what Bill Fontana, Grace Cathedral’s 2026 Artist in Residence in what the cathedral called its “Year of Resonance,” went looking for. He mounted vibration sensors on the carillon bells in the tower and placed microphones inside organ pipes that nobody was playing. The signals he captured were the harmonic life of the building between performances: the bells and pipes resonating in sympathy with San Francisco and with the cathedral’s own structure.
The physics in one paragraph
Every object that can vibrate has frequencies it prefers, set by its size, shape and material. A bell cast to ring a particular note will absorb energy from any vibration arriving at or near that note and start to move with it, the way a child’s swing gains height only when pushed in time. This is sympathetic vibration, and it is why a piano string sings when you shout its note at it, why a wine glass answers a singer, and why an organ pipe sitting cold in a loft is never entirely silent. The resonance is tiny but constant. As Dean Malcolm Clemens Young put it, “there is no moment when that stops.”
What visitors heard
Fontana spatialized those captured signals through a system Meyer Sound installed in the nave: eight ULTRA-X20 loudspeakers and four USW-112P subwoofers, driven by a Galileo GALAXY processor and moved through the space with Spacemap Go. Visitors in the nave heard the bells and pipes of their own building, not struck but humming, placed and moved around them in a room that already has a long natural reverberation. Nothing was composed in the usual sense; the material was whatever the city and the structure happened to set ringing.
Fontana’s description was the clearest: “What you’re experiencing is the building becoming a listening device … almost like a living spirit.” It was his first bell project in the United States. He had worked the same way with the bells of St. Peter’s Basilica in Rome and the structure of Tate Modern in London.
Why it moves people
A cathedral is built to make sound larger than the person making it. Fontana reversed the flow. Instead of a voice or an organ filling the room, the room’s own quiet vibration was amplified until a person could stand inside it. The effect is a demonstration that a building is not inert, that it has been answering the city at its own pitches for a century, and that we live inside resonant objects all the time.
Dates
“Resonance” opened June 24, 2026 and closed September 20, 2026. The carillon and the organ remain, still trembling, unamplified.
