We notice the movement of automobiles and beings in the street, but we do not notice that the earth turns. We believe that automobiles go at a great … - Alexander Calder

In the Spring of 1926 I made some toy animals of curtain rods, broom handles, etc., and wire. Later, a few dolls, which I animated.... In the Winter of 1927–1928 I made some more toys for a friend to take home as gifts, and having shown them to De Creeft a Spanish sculptor with a very acute sense of humor, I was urged by him to make some more toys and to expose them at the . I did this and then began to make more elaborate toys, with articulation, in which the movements got more and more realistic, always adhering to the same basic materials. In this way I have developed quite an elaborate circus of which animation is one of the chief characteristics....

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 colored rectangles he had on the wall. Shortly after that I made some mobiles.

The two motor driven "mobiles" which I am exhibiting [August, 1933] are from among the more successful of my earliest attempts at plastic objects in motion. The orbits are all circular arcs or circles. The supports have been painted to disappear against a white background to leave nothing but the moving elements, their forms and colors, and their orbits, speeds and accelerations.