Tangible User Interface
<interface> An attempt to give physical form to digital information, making bits directly manipulable and perceptible by people.
Tangible Interfaces will make bits accessible through augmented physical surfaces (e.g. walls, desktops, ceilings, windows), graspable objects (e.g. building blocks, models, instruments) and ambient media (e.g. light, sound, airflow, water-flow, kinetic sculpture) within physical environments.
MIT Tangible Media Group (http://tangible.media.mit.edu/).