1950s - 1960s, Excerpt, What Abstract Art Means to Me (1951)
“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.”
            Question: How did the mobiles start? 
1950s - 1960s, Excerpt, Interview with Alexander Calder (1962)
        
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Alexander Calder 41
American artist 1898–1976Related quotes
                                        
                                        Quote (1951), in  'What Abstract Art Means to Me' http://www.jstor.org/stable/4058250, George L. K. Morris, Willem De Kooning, Alexander Calder, Fritz Glarner, Robert Motherwell, Stuart Davis; as cited in the The Bulletin of the Museum of Modern Art, Vol. 18, No. 3, (Spring, 1951), pp. 2-15 
1950s - 1960s
                                    
                                        
                                        version in original Dutch (origineel citaat van Hendrik Werkman, in het Nederlands): ..Als ik eenige teekeningen gemaakt heb zie ik ze ook direct in kleuren [en] vergroot voor me.. 
In a letter (nr. 356) to Bastiaan Kist, 9 Sept. 1943; as cited in H. N. Werkman - Leven & Werk - 1882-1945, ed. A. de Vries, J. van der Spek, D. Sijens, M. Jansen; WBooks, Groninger Museum / Stichting Werkman, 2015 (transl: Fons Heijnsbroek), p. 176 
1940's
                                    
As quoted in A Rockwell Portrait : An Intimate Biography (1978) by Donald Walton, p. 198
Source: 1960s, Jours effeuillés: Poèmes, essaies, souvenirs (1966), p. 288, Arp refers in this quote to the structure in the early watercolor paintings by his wife Sophie Taeuber.
                                        
                                        Quote from his letter to the Dutch modern architect Oud, 24 June 1919; as quoted in Mondrian, -The Art of Destruction, Carel Blotkamp, Reaktion Books LTD. London 2001, p. 126 
1912 – 1919
                                    
“I do two things: I design mobile computers and I study brains.”
Jeff Hawkins at TED2003: "How brain science will change computing" https://www.ted.com/talks/jeff_hawkins_on_how_brain_science_will_change_computing/transcript?utm_content=ted-androidapp&awesm=on.ted.com_d0o6F&utm_medium=on.ted.com-android-share&utm_source=direct-on.ted.com&utm_campaign= (February 2003)
                                        
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Quote from Delaunay's 'First Notebook, 1939', as cited in The New Art of Color: The Writings of Robert and Sonia Delaunay, Viking Press, 1978; as quoted on Wikipedia / Delaunay 
1915 - 1941
                                    
Remark to the Austrian Chief of Staff Conrad von Hotzndorf (21 January 1909) during the Bosnian crisis, quoted in L. C. F. Turner, 'The Significance of the Schlieffen Plan', in Paul Kennedy (ed.), The War Plans of the Great Powers, 1880-1914 (Boston: Allen & Unwin, 1985), p. 214
“The immobile had been changed to mobility.”
after 1920, The Epic, From immobile form to mobile form (1925)