Here’s an example of tactile or surface transducers in action.
David Tudor (1973) — Rainforest IV: collective performance
The fourth version (1973) is the result of a collaborative work environment, mixing in space sounds live suspended sculptures and found objects, and transformed by an audio system reverberations.
Here’s another version:
From the Getty Research Institute:
Rainforest IV (1973) is an electroacoustic environment conceived by David Tudor and realized at “The Art of David Tudor” symposium by the group Composers Inside Electronics. It grew out of a 1973 workshop in Chocorua, New Hampshire, that included David Tudor, John Driscoll, Phil Edelstein, Linda Fisher, Ralph Jones, Martin Kalve, David Tudor, and Bill Viola. In this performed installation, each composer designs and constructs up to five sculptures, which function as instrumental loudspeakers under his or her control, and each independently produces sound material to display the sculptures’ resonant characteristics. The appreciation of Rainforest IV depends upon individual exploration, and the audience was invited to move freely among the sculptures. This excerpt takes the listener inside a hanging sculpture that appears to be a milk bottle, to reveal the transducer within.