More infos see:

http://www.musikaktionen.de/en/traveling-exhibitions/sounding-numbers/

Consists of slow and fast regularities, "heartbeats" and "fluttering heart-hertz," harmonies and nodes, musical patterns and vibration units.

The exhibhtion is divided into 4 sections, each provided with several exhibits:

1. Heartbeat: Tempo and measures

Slow regularities, counted per minute, can be organized into measures, doubled and halved just by changing their emphasis.

2. "Fluttering Heart-Hertz": Notes and parameters

Fast regularities, counted and calculated per second, give way to pitches that can be changed according to parameters such as length and tension.

3. Vibrations and Whole Numbers

The aesthetic and mathematical phenomenon of vibration theory. Divide a long string into 2, 3, 4 or 5 segments. Explore Pythagoras, theory and harmony on the Monochord.

4. The perpetual patterns of music making

Music is made up of sounds, measures, tempo and tone colors. Oftentimes, short motives are taken and layered one atop the other, repeated, or varied.