Since sound comes off both sides of the glass, the speaker projects a full 360 degrees of sound that envelops listeners. By design, this glass sheet can reproduce notes from nearly every instrument, from an upright bass to a piccolo. A sound generator in its 10-inch-tall base sends the pane vibrating, and its sail-like shape helps it handle varied tones: Bass emanates from the lower portion, midrange comes off the midsection, and high frequencies radiate from the tip. The heft of the base deepens low frequencies, while three holes near the top cut mass to tune high notes.