"Whether it is snapping fingers, whistling notes, singing songs, or remaining silent, a space responds. The listener is immersed in the aural response of the space, as if in auditory dialogue with the environment. By responding to human presence, aural architecture is dynamic, reactive, and enveloping. In contrast, because humans do not have the means of creating the presence of light, a space does not react to our visual presence, but is only manifested through the interruption - as shadows or reflections."
- barry blesser & linda-ruth salter
quoted from, Spaces Speak, Are You Listening?