Six loudspeakers have been moun-ted along a circularly curved flat iron suspended freely from the ceiling. A chair below it is designed so that back, shoulder and arm position promote concentration on symmetric listening. Lines of sound running linearly between the sound points form the arch above the person.The FIRMAMENT seeks to explore the zenith acoustically. Curvatures ascen-ding symmetrically in counter motion penetrate each other in the zenith.For a very brief moment, the zenith of a firmament materializes overhead.