A museum in action ! A look at mills, through the centuries and around the world. A group of working or experimental models, as well as a collection of small artisanal mills and related items, tell the story of Man's capacity for harnessing natural sources of energy. The models are started up manually, and worked by water or wind. More than 70 mills, educational tools and instruments allowing everyone, whatever their age, to manipulate and experiment in order to understand better how these machines work and discover the many uses to which they can be put.