The Listening Tree person leaning ear close to tree bark, contact transducer visible. Outdoor festival setting, soft daylight. Future Limerick Festival 2022.
Trees are acoustically active organisms. The Listening Tree makes their inner life audible โ contact transducers attached to living trunks transform the wood itself into a speaker, letting you hear the water moving, the cells expanding, the slow structural adjustments of a living body.
The Concept
We live alongside trees without ever hearing them. The sounds of water moving through xylem and phloem, cellular processes, structural adjustments, and seasonal biological activity โ all of it happens just outside the range of human hearing, or at volumes too low to perceive without amplification.
The Listening Tree bridges that perceptual gap. By attaching high-quality contact transducers to living tree trunks and using the wood itself as a resonating chamber, the installation makes the tree's internal acoustic life audible. The tree becomes both the instrument and the music.
What You Hear
The sounds captured are real biological signals, not recordings or simulations:
- Water transport through the vascular system (xylem and phloem)
- Cellular expansion and contraction
- Structural micro-movements โ the wood adjusting under gravity, wind, and its own weight
- Root system activity
- Responses to temperature change, rain, and barometric pressure
- Seasonal processes: spring growth acceleration, autumn preparation for dormancy
Technical System
The installation uses professional-grade contact transducers (also called contact microphones or bonephones) mounted directly to the bark using bio-compatible adhesives that cause no damage to the tree.
Signal Processing
- Frequency shifting: Brings ultrasonic biological activity into the audible range
- Amplitude amplification: Brings subtle sub-threshold sounds to perceptible levels
- Temporal stretching: Reveals slow processes in real time
- Harmonic enhancement: Emphasises the musical qualities present in natural signals
Installation Infrastructure
- Weatherproof amplification systems for outdoor and year-round use
- Bio-compatible mounting โ minimal-impact, reversible
- Long-cable routing to keep electronics away from tree root zones
- Optional listening stations (seating, headphones for intimate engagement)
Scientific Collaboration
The project involves ongoing collaboration with botanists and acoustic ecologists. Data collected contributes to research on tree health monitoring through acoustic analysis โ the acoustic signature of a tree changes when it is stressed by drought, disease, or physical damage, making bio-acoustic monitoring a potential early-warning system for tree health.
The Experience
Visitors consistently report the tree sounds as meditative, surprisingly musical, and emotionally moving. The experience challenges the assumption that trees are passive, silent objects โ revealing them as active, responsive, acoustically rich organisms. Many describe it as one of the most genuinely surprising sound experiences they have had.
The installation can be configured for contemplative listening (slow, unprocessed sounds through speakers or headphones) or as a more overtly musical experience (processed signals through a spatial speaker array).
Have a Project in Mind?
We work with artists, institutions, festivals, and private clients. Whether it's a commission, a collaboration, or an idea in need of a technical and creative partner โ we'd love to hear about it.