Liberty: what is it, definitions, uses.

Very few notions are simultaneously evident and hard to grasp. Liberty is one of them.

If we look around it is self evident that some things are freer than others.
For instance wheel-chairs can be moved a lot easier than table chairs on a flat surface but are harder to be carried up and down the stairs or on rugged terrain. Or, on a different level of discussion, chained dogs are less free than stray ones.
Yet nobody in his right mind wastes a thought on whether wheel chairs might be concerned about their lack of ‘upward mobility’ while some of us, but not so many, do think about how come the vast majority of chained dogs usually come back after having accidentally been set free and wonder about why dogs which have grown up on their own can indeed become good companions but would never accept to be tied…