The sunlight synth experiences the passing of time as sunlight creeping across a floor. As shadows move across the space, and as light levels fluctuate, the sunlight synth responds with shifts in texture, density, and character. In bright sunlight, the synth "charges," storing energy for later, darker periods. At night, and in particularly dark moments during the day, the synth uses its stored energy to continue to produce sound. Once its energy begins to dwindle, the synth again changes character to reflect its new state. The sunlight synth sonifies the sunlight and shadows passing through a given space, creating a unique sonic fingerprint of that space in place and time, and illustrates different modes and experiences of passing time.