Soundscape (Wave Alchemy)
A physical-visual language of emotionally expressive waveforms · ACM CHI 2013
- Team
- Dan Sawada, Anirudh Sharma, Sujoy Kumar Chowdhury, Christine Hsieh, Andrea Miller
- Context
- MIT Media Lab, 99 Fridays. Paper accepted at ACM CHI 2013.
- Exhibition
- MIT Museum, embodied HCI exhibition
Most of the energy we encounter in daily life – a voice, a gust, a vibration – arrives as a waveform and vanishes. We sense its emotional weight in the moment but have no physical artifact to return to. Photographs freeze a scene; audio recordings flatten it. Neither preserves the felt quality of the energy itself.
Approach
Wave Alchemy asks what happens when you give that energy a body. The system captures an acoustic or kinetic signal, decomposes it into frequency components, and drives an array of pin-actuated rods whose heights trace the waveform in three dimensions. Each rod is topped with a spherical element, and the ensemble forms a standing-wave sculpture that evolves in real time. The result is a tangible object you can walk around, a physical rendering of the original signal's spectral content.
System
The sculpture is built on the Radical Atoms framework developed at the MIT Media Lab – the idea that physical materials should be as malleable and dynamic as pixels on a screen. Each pin is individually addressable through a linear actuator stage, driven by a microcontroller interpreting incoming waveform data. Multiple overlapping sine waves create complex interference patterns: double-helix formations, travelling pulses, and resonance nodes that shift as the input changes.
Interaction
The interaction model is deliberately simple: approach the sculpture, and it responds to ambient sound or movement in the room. The emotional register of the input – sharp and percussive, slow and rolling – maps directly onto the physical form. A whisper produces gentle undulations; a clap triggers a sharp transient that propagates outward from the center. The sculpture becomes a kind of seismograph for the emotional texture of a space.
Demonstrated at the MIT Museum as part of an exhibition on embodied human-computer interaction, Wave Alchemy explores how computational materials can bridge the gap between ephemeral sensory experience and lasting physical form.