I know how Action is defined, the fact the planck's constant h is an action, the variational theorems associated with it, as the principle of stationary action, and, mostly, the important facts that from this principle comes the relations between space homogeneity and linear momentum conservation, space isotropy and angular momentum conservation, time homogeneity and energy conservation. My question is: what physically, intuitive meaning can have the action? Is it possible to visualize it in some way or to relate it directly to some property of space or of something else? I think we should investigate more this concept, if we want to understand better the connection between the space (time?) structure and the constant h, that is, between General Relativity and quantum mechanics. Do you agree?