From outside the greenhouse door, rain is one even sheet of noise. Push the door open and the sound immediately separates into overlapping events of many different sizes.
Microphone one: glass
The old glass is not flat. Replacement panes of different thicknesses have left each one slightly distinct. In light rain, glass near the ridge makes short, crisp taps; closer to the eaves, water gathers and stretches each drop into a longer sound before it slides down the seam.
We fixed the first microphone to the window frame without letting it touch the glass. The clearest sound in the recording is not impact but the fine friction of water moving over ageing sealant. It is continuous, yet shifts slowly with the wind outside.
The greenhouse did not amplify the rain. It simply separated “raining” into materials that could be recognised one by one.
Microphone two: leaves
Tall elephant-ear plants reach towards the glass roof, their leaves catching water from the seams. The first drop usually rests between the veins; more water slowly adds weight until the whole mass slides along the tilted edge into the pot. The cycle lasts about twenty seconds, but no two repetitions are identical.
Smaller ferns produce no distinct impacts. Their fine leaves break the water apart into a continuous high frequency resembling sandpaper. When the two microphone signals are combined, the sense of space comes not from reverberation but from the different speeds at which the plants process water.
Microphone three: the gutter
As the rain strengthened, the zinc gutter emerged from the background. At first there were only widely spaced, hollow drops. Then water rose above a seam and the sound became a continuous, low metal vibration. It travelled through the brackets into the greenhouse frame, setting even distant panes into a faint resonance.
At 3:17 p.m., the rain suddenly weakened. Glass and leaves fell quiet within a minute, but the gutter continued for nine more. After the last drop struck the bottom of the barrel, only the hinge of a vent and the distant road remained. We kept the entire ending instead of replacing it with a fade.
Three materials
Crisp impacts and slow sliding, shifting position with the wind.
Water gathers and releases at once, creating irregular, close-range low frequencies.
Hollow drops become a continuous vibration; this is the last sound to stop.