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            Quote from 'Grundbegriffe der neuen Gestaltenden Kunst', essay by Van Doesburg (published between 1921-23 in De Stijl) - last Chapter; as quoted in 'Fifty Years of Accomplishment, From Kandinsky to Jackson Pollock', by Michel Seuphor, Dell Publishing Co. 1964, p. 86 
1920 – 1926
        
Small Houses: Their Economic Design and Construction (1922)
1830s, Sir Walter Scott (1838)
Source: Autopoiesis and cognition: The realization of the living (1980), p. 137
Source: Autopoiesis and cognition: The realization of the living (1980), p. 137.
                                        
                                        Cited in: Harold Chestnut (1967) Systems Engineering Methods. p. 121 
A methodology for systems engineering, 1962
                                    
“Unity is vision; it must have been part of the process of learning to see.”
Source: The Education of Henry Adams
“Nature creates unity even in the parts of a whole.”
                                        
                                        25 January 1857 (p. 346) 
1831 - 1863, Delacroix' 'Journal' (1847 – 1863)
                                    
 
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                        