Five photographs of the sky, each subtracted from its own reflection.
Reflect a frame about the diagonal that runs from one corner to the other, and subtract the reflection from the original. Wherever the mirror gave the field back exactly, the two cancel and nothing sounds. Everything you hear is what it failed to return. The series is named for the part you cannot hear.
The Cosmic Cliffs first, then a planetary nebula that really is round and is audibly quieter for it, then five galaxies scattered off the diagonal that never stop, then the first deep field, then one very large mosaic.
Four of the five are as far from symmetric as a random field would be. Knowing that ordinary case is ordinary took eighty-nine measurements before a note was rendered.
Source: JWST NIRCam imaging, Early Release Observations (programs 2731, 2732, 2733, 2736) and program 1328.