We know that sound is pressure fluctuations over time. And we know that a vinyl record is a translation of pressure fluctuations over time into space. As the needle moves through the grooves at a constant speed, sound is reproduced in time.

Now imagine a special room in which air pressure at every point in space is controlled so precisely that you can walk through it and hear a sound. You can walk faster to hear the sound speed up and become higher pitched, backwards to hear it backwards. Stop and you hear nothing: you just experience the particular air pressure at that point in space.

A physical installation of air pressure fluctuations in space.

A sound installation.