Sound is a physical form. Sound waves have physical dimensions and interact dramatically with architectural structures. The ear hears sound as vibrations brush against small hairs inside our heads. This tactile dimension to sound makes it inherently sculptural; it exists in space in a concrete way. A meandering line traces the parallel development of music and our built environment. Did our neolithic ancestors implement acoustic design 5500 years ago? Architects outline the physics of acoustics and how buildings can shape what we hear. Composer Alvin Lucier describes the details of how a room can be an instrument. Artists, composers and architects consider the subtleties of sound and how they can and should shape our sense of place. First broadcast as The Lyric Feature on RTÉ lyric fm. Funded by the Broadcasting Authority of Ireland