The Sustain
A carillon is a set of at least twenty-three cast bronze bells, tuned chromatically, played from a keyboard called a baton clavier. The performer strikes the keys with the sides of loosely clenched fists and presses foot pedals connected to the largest bells by wire. The force required is substantial — the clappers in major carillons weigh up to several hundred kilograms, and the connection is direct mechanical linkage, no amplification. The Royal Carillon of Mechelen has forty-nine bells. The Riverside Church carillon in Manhattan has seventy-two, the largest tuned set in the world, with a bourdon bell weighing approximately twenty tonnes.
The bells cannot be dampened. There is no equivalent of a piano's damper pedal lifted in reverse, no mechanism to stop a struck bell from ringing. Each note, once played, persists until the bronze dissipates its energy — a process that can take fifteen to thirty seconds for a large bell, longer for the bourdon. The performer does not play into silence. Every note enters a sound field created by every other note still decaying. The composition at any given moment is not just the notes currently being struck but the entire residue of everything struck in the preceding half-minute, at various stages of decay, each still contributing its fundamental and its partials to the aggregate harmonic field.
The carillonneur composes within this accumulation. A note that harmonizes with the bell struck three seconds ago may clash with the bell struck twelve seconds ago, still audible in the partials. The performer must track not just what to play next but what is still ringing and what has decayed enough to release its harmonic claim. Jef Denyn, the Belgian carillonneur who revived the art in the early twentieth century at Mechelen, developed the tremolo technique — rapidly alternating two clappers against a single bell to create a singing, sustained tone. The technique converts a percussive instrument into something approaching legato, but it does so by filling the acoustic space with overlapping transients, each decaying independently. The more the carillonneur plays, the more the instrument remembers.
In 1508, Michelangelo Buonarroti began painting the ceiling of the Sistine Chapel using the buon fresco technique. Pigment is applied directly to wet lime plaster — the intonaco — while it is still fresh. As the plaster cures, calcium hydroxide reacts with atmospheric carbon dioxide to form calcium carbonate, crystallizing around the pigment particles and locking them into the wall surface. The color does not sit on the wall. It becomes part of the wall. Once the plaster sets, the image cannot be altered without destroying the substrate.
The constraint is temporal. Wet plaster remains workable for eight to twelve hours. Each day the plasterer applies a new section of intonaco — a giornata, literally a day's work — and the painter must complete that section before it cures. The joins between adjacent giornate are visible on close inspection: slight ridges where one day's wet edge meets the previous day's hardened surface. Michelangelo completed the ceiling in approximately 450 giornate over four years. Each section was composed to harmonize with the sections already set on all adjacent sides. He could not go back. Yesterday's giornata was now calcium carbonate — as permanent as the stone it covered.
The fresco painter's problem is the carillonneur's problem transposed into a visual medium. Each action enters a field of previous actions that cannot be undone. The composition is not a plan executed on a blank surface but a negotiation with what has already hardened. In fresco, the accumulation is spatial — the wall fills in from one edge, each section constrained by what borders it. In the carillon, the accumulation is temporal — the sound field fills with decaying notes, each new note constrained by what is still ringing. Both require the performer to hold the entire history of the work in active consideration while making the next irreversible mark.
The board game Go — weiqi in Chinese, baduk in Korean — is played on a nineteen-by-nineteen grid. Players alternately place black and white stones. A placed stone does not move. It can only be removed from the board by capture, when all its adjacent empty intersections are occupied by the opponent. Otherwise, it stays. The board is a record of every decision both players have made, each stone still exerting influence on the territory around it.
A Go position in the middle game is an accumulated landscape. Each new stone must be read not in isolation but in relation to every other stone on the board — stones placed fifty moves ago are still active participants in the current position. A local exchange in one corner can change the value of a configuration on the opposite side of the board. The skill of Go is not primarily tactical, like chess, where pieces capture and leave the board, progressively simplifying the position. Go positions become denser and more constrained as the game proceeds. The endgame is played within a structure entirely created by the players' earlier decisions, and the quality of those early decisions is revealed only now, when the accumulated stones define territories that cannot be reconfigured.
Large concrete structures cannot be poured all at once. A dam is built in sequential lifts — each new layer placed on top of the previous one after partial curing. The bond between lifts depends on timing. Too soon, and the lower lift cannot bear the weight. Too late, and a cold joint forms — a plane of weakness where the new concrete fails to bond with the old. Each pour is composed within the constraints of what has already set.
Hoover Dam was poured in 230 separate columns, each approximately five feet tall, cooling pipes threaded through each block to manage the heat of hydration. Without the cooling system, the concrete at the dam's center would have reached temperatures high enough to crack the structure from within — it would have taken 125 years to cool naturally. Each block was poured into a landscape of blocks already setting, each constraining the thermal and structural options for the next. The dam accumulated itself.
These are not systems with memory in the usual sense — they do not store and retrieve. They accumulate. Each action enters a field of previous actions that cannot be undone, and the field is not a passive record but an active participant in what comes next. The carillon's residue is acoustic. The fresco's residue is chemical. The Go board's residue is strategic. The dam's residue is structural. But in each case, the present moment is not composed on a blank surface. It is composed within the sum of everything that has already happened, still happening, still exerting its influence.
The carillonneur who cannot dampen bells develops a sensitivity to harmonic relationships that a pianist — who can silence any note instantly — never needs. The fresco painter who cannot revise yesterday's giornata develops a decisiveness that an oil painter — who can scrape and repaint indefinitely — never acquires. The Go player who cannot take back a stone develops a depth of reading that a chess player — whose pieces leave the board — rarely matches. The constraint of accumulation is not a restriction on the performer. It is the mechanism by which the performance acquires depth.
The sustain is not the problem. The sustain is the instrument.