Question: How did the mobiles start? The mobiles started when I went to see [[w:Piet Mondrian|Mondrian [in Paris, 1930]. I was impressed by several c… - Alexander Calder

How can art be realized? Out of volumes, motion, spaces bounded by the great space, the universe. Out of different masses, tight, heavy, middling - indicated by variations of size or color - directional line - vectors which represent speeds, velocities, accelerations, forces, etc...- these directions making between them meaningful angles, and senses, together defining one big conclusion or many. Spaces, volumes, suggested by the smallest means in contrast to their mass, or even including them, juxtaposed, pierced by vectors, crossed by speeds. Nothing at all of this is fixed. Each element able to move, to stir, to oscillate, to come and go in its relationships with the other elements in its universe. It must not be just a fleeting moment but a physical bond between the varying events in life. Not extractions, but abstractions. Abstractions that are like nothing in life except in their manner of reacting.

As truly serious art must follow the greater laws, and not only appearances, I try to put all the elements in motion in my mobile sculptures.

Therefore, why not plastic forms in motion? Not a simple translatory or rotary motion but several motions of different types, speeds and amplitudes composing to make a resultant whole. Just as one can compose colors, or forms, so one can compose motions.