In 1910 Alexander Scriabin finished Prometheus: The Poem of Fire, Op. 60, and wrote into the score a part for an instrument that barely existed: the tastiera per luce — a “keyboard of light” that would flood the hall with colour in step with the music.
It was essentially unperformable. The 1915 Carnegie Hall attempt used a crude colour projector and was, by all accounts, a disappointment. For over a century the light part has mostly been ignored, approximated, or quietly dropped.
RADIANCE, by Grimanesa Amorós, commissioned by the LA Philharmonic to accompany Prometheus across three consecutive performances at Walt Disney Concert Hall, is what that idea looks like when the technology has caught up.
The piece
- 60 × 35 × 5 feet (18.29 × 10.67 × 1.52 m), suspended above the orchestra
- Reflective material, colour-shifting rope-like LED tubing, and custom electrical hardware
- A programmed lighting sequence, synchronised with the concert hall’s existing house lighting system
- Six major synchronised moments across the performance
The technical decision that matters most
She synchronised to the house lighting system rather than running independently.
That sounds like a logistical note and it is the whole design. A light sculpture above an orchestra is competing with the room: the hall’s own lighting has to illuminate the players so they can read, and it has to serve the audience. Two uncoordinated light sources in one room produce visual noise — your sculpture’s deep blue moment gets washed out by the stage wash, or the players end up lit in a colour that makes the wood look wrong.
Tying the sculpture into the house system means the room becomes one instrument. A cue can dim the stage and lift the sculpture, or push both the same direction. That is not something you can bolt on afterwards; it means working inside the venue’s existing control infrastructure, with the venue’s lighting department, to the venue’s cue sheet.
Six moments, not continuous animation, is the other good call, and it is the one most light artists get wrong. The instinct with addressable LED is to animate constantly, because you can. But against a 20-minute orchestral work, continuous movement becomes wallpaper — the eye adapts within a minute and stops reading it as event. Six discrete transitions, placed at structural moments in the score, means each one lands. It is the difference between accompaniment and decoration.
Why reflective material is doing as much work as the LEDs
Amorós’ practice has long used light as a sculptural material rather than an illuminant, and the material list here shows how. Rope-like LED tubing is a diffuse line source — soft, continuous, with no hotspot. Put it against reflective surfaces and the light multiplies and smears: the sculpture appears to have far more light in it than it contains, and the apparent form shifts as the colour changes, because different wavelengths bounce differently off the material.
The practical upside in a concert hall is substantial. A bright emissive source above an audience is a glare problem — people are looking up and forward, and a hard LED point in the field of view is painful and distracting from the music. A diffuse source bouncing off reflective material produces presence without a source you can stare into.
Prometheus is the right piece for this and not an accident
Scriabin was a synaesthete, or at least believed himself one, and he had an elaborated colour-pitch mapping — C was red, D yellow, F-sharp bright blue. Prometheus is built on his “mystic chord” and he intended the work as a total sensory event, part of a lifelong project toward the Mysterium: a week-long multi-sensory work in a Himalayan temple involving music, dance, scent and light, intended to end the world. He died before writing it.
So the light is not an add-on to Prometheus. It is notated, and performing the piece without it is performing an incomplete score.
There is a long thread running from here into everything this publication covers. Scriabin’s colour organ connects back to Bainbridge Bishop and A. Wallace Rimington’s colour organs in the 1890s, forward to Thomas Wilfred’s Clavilux and Lumia in the 1920s, to the liquid light shows of the 1960s, to Oskar Fischinger and visual music, and to every audio-reactive visual anyone has written in TouchDesigner since. The idea that music should be seen is one of the oldest in media art, and it has been waiting on hardware for most of its history.
What to take from it
Light cued to structure beats light cued to amplitude. The reflexive approach to audio-visual work is to drive brightness or colour from an FFT. That gets you something that moves with the music and means nothing — it tracks the surface. Six cues placed at the score’s actual structural turns is an interpretive decision, and interpretation is what makes it a collaboration rather than a visualiser.
Integrate with the venue’s systems, not around them. For anyone proposing work in a theatre, hall or gallery: the building already has lighting, control and a crew who know it. Designing to join that system rather than to coexist with it is both better-looking and vastly easier to get approved.
And a notated instruction from 1910 is a commission brief. There is a whole repertoire of scores with unrealisable performance directions — light parts, spatial arrangements, instruments that were never built. They are, read generously, open invitations.