Tuning socle

What can you do here
Wet the granite surface with a small amount of water from the container. Rub the wet patch vigorously and listen to the sound emitted by granite block.

If you cannot hear any sound, try hitting the pedestal with your fist. Do not use any other objects to do that.

How does it work
Water reduces the friction between hands and granite, which makes rubbing the stone possible. Owing to that rubbing, the deeply cut granite is made to vibrate slightly. The vibrations are the source of sound, whose properties depend on the structure of the stone. The stone presented can be classified among idiophones, i.e. instruments where a solid body with natural and unchanging elasticity is the sound source.

Interesting facts
The oldest idiophones (dated to the fifth millennium BCE) were excavated in Egypt.