Even by computer music standards, this is pretty plinky material. So why is it worth hearing? For one thing, Bischoff really does compose with his silences (see the title track); even when spare, the music doesn't feel random. And his feel for textures in between the digital chirps -- try out the noise freakouts of "Sidewalk Chatter" or the drones-plus-chimes of "Local Color" -- is evocative and winning. To be sure, this is mostly a quiet album, though it does build (in its way) to the percussive climax of "Surface Effect." Overall, this is new-classical headphone listening at its best.