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A Treatise on Algebra (1842)
                                    
undated quotes, M.C. Escher Foundation
                                        
                                        Vol. I: Arithmetical Algebra Preface, p. iii 
A Treatise on Algebra (1842)
                                    
“I am entirely alone. I and my shadow fill the universe.”
Source: The Infernal Desire Machines of Doctor Hoffman
“My life’s work has been accomplished. I did all that I could.”
                                        
                                        The Observer [London] (15 December 1991) 
1990s
                                    
Source: 1940s, I is Style (2000), p. 48 : quoted by Margareth Miller to Oliver Kaufmann [the first principle aim is his Merzbau]
                                        
                                        in a letter to her sister Edma Morisot, 23 April 1869; as cited in The Correspondence of Berthe Morisot, ed. Denis Rouart; Camden, London 1986 / Kinston, R. I. Moyer Bell, 1989, p. 29 
1860 - 1870
                                    
 
                            
                        
                        
                        