The next step in sculpture is motion.
That others grasp what I have in mind seems unessential, at least as long as they have something else in theirs.
The first inspiration I ever had was the cosmos, the planetary system.
You see nature and then you try to emulate it.
The sense of motion in painting and sculpture has long been considered as one of the primary elements of the composition.
To most people who look at a mobile, it's no more than a series of flat objects that move. To a few, though, it may be poetry.