When we are having a conversation, walking together, or simply sitting next to someone else, our postures and movements are coordinated.

There is no way to force a pendulum to oscillate at a different rhythm, determined exclusively by its length

Probably of Paleolithic origin and present since the first civilisations, the sling is ancient and ubiquitous not only as a weapon, but also as the paradigm of circular movement.

Migrating time after time, we reached every corner of the world. Slowly at first. Then, with the invention of boats, quite fast. Today, thanks to motorised vehicles, at great speed. We are the most migratory species in the world.