1930s - 1950s, Statement from Modern Painting and Sculpture', (1933) 
Source: en.wikiquote.org - Alexander Calder / Quotes of Alexander Calder / 1930s - 1950s / Statement from Modern Painting and Sculpture', (1933)
                                    
“the idea of movement…. just transferred from the Nude [ Nude Descending a Staircase, No. 2 - Duchamp painted this in 1912] into a bicycle wheel [ Bicycle wheel, his early ready-made from 1916-17].”
            Quote in Looking at Dada, eds. Sarah Ganz Blythe & Edward D. Powers - The Museum of Modern Art New York, ISBN: 087070-705-1; p. 41
Duchamp is looking back shortly before his death in 1968 
1951 - 1968
        
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Marcel Duchamp 66
French painter and sculptor 1887–1968Related quotes
                                        
                                        Four-Word Letter, Pt 2. 
Catch For Us The Foxes  (2004)
                                    
                                        
                                        long quote from Duchamp's letter to his sister Suzanne Duchamp, New York, c. 15 Jan. 1916; as quoted in The Duchamp Book, ed. Gavin Parkinson, Tate Publishing, London 2008 pp. 157-158 
1915 - 1925
                                    
“I don't wear anything in bed. But I'm not ready for a nude scene quite yet.”
A woman of extremes (2001)
“The bicycle, the bicycle surely, should always be the vehicle of novelists and poets.”
Source: Parnassus on Wheels
                                        
                                        The Bicycle 
Don Camillo and the Prodigal Sun (1952)
                                    
                                        
                                        Kirchner; as quoted in Ernst Ludwig Kirchner: ein Künstlerleben in Selbstzeugnissen, Andreas Gabelmann (Claire Louise Albiez, translation); Hatje Cantz Verlag,  Ostfildern, Germany 2010, p. 28 
undated
                                    
                                        
                                        Quote (1903), # 485, in The Diaries of Paul Klee, translation: Pierre B. Schneider, R. Y. Zachary and Max Knight; publisher, University of California Press, 1964 
1903 - 1910