Therefore, why not plastic forms in motion? Not a simple translatory or rotary motion but several motions of different types, speeds and amplitudes c… - Alexander Calder

What I like best is the acoustic ceiling in Caracas, in the auditorium of the university [Central University of Venezuela]. It's made from great panels of plywood - some thirty feet long - more or less horizontal and tilted to reflect sound. I also like the work I did for UNESCO in Paris and the mobile called 'Little Blue under Red' that belongs to the Fogg. That one develops hypocycloidal and epicycloidal curves. The main problem there was to keep all the parts light enough to work.

Fernand Léger's film, 'Ballet Mecanique' is the result of the desire for a picture in motion.

It is a matter of harmonizing these movements, thus arriving at a new possibility for beauty.