Alexander Bogdanov, cited in: James Patrick Scanlan, (1965). : Pre-revolutionary philosophy and theology. Philosophers in exile. Marxists and Communists. p. 398
“[The Constructive idea.. ] has revealed a universal law that the elements of a visual art such as lines, colours, shapes, possess their own forces of expression independent of any association with the external aspects of the world; that their life and action are self-conditioned psychological phenomena rooted in human nature; that those elements are not chosen by convention by any utilitarian or other reason as words and figures are, they are not merely abstract signs, but they are immediately and organically bound up with human emotions. The revelation of this fundamental law has opened up a vast field in art giving the possibility of expression to those human impulses and emotions which have been neglected.”
            Naum Gabo (1937) 'Editorial', p. 7 as cited in: W. Rotzler (1989) Constructive Concepts - A History of Constructive Art from Cubism to the Present, Rizzoli. 
1936 - 1977, Circle: International Survey of Constructive Art, 1937
        
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Naum Gabo 23
Russian sculptor 1890–1977Related quotes
                                        
                                        Quote in 'Plastic Art and Pure Plastic Art', Piet Mondrian (1937), in 'Documents of modern Art', for Wittenborn, New York 1945, p. 13; as quoted in Abstract Expressionist Painting in America, W.C, Seitz, Cambridge Massachusetts, 1983, p. 55 
1930's
                                    
                                        
                                        note: Without this understanding a 'conceptual' form of presentation is little more than a manufactured stylehood, and such art we have with increasing abundance. 
'Joseph Kosuth: Introductory note by the American editor', in Art-Language Vol.1 Nr.2, Art & Language Press, Chipping Norton (February 1970), p.3.
                                    
                                        
                                        Quote from Yves Klein's lecture at the Sorbonne in 1959; published in Studio International, Vol. 186 (1973), p. 43; also quoted in: David Batchelor (2008) Colour. p. 122 
before 1960
                                    
                                        
                                        Source: The Life of Pasteur (1902), p. 163 
Context: I confess frankly, however, that I am not competent on the question of our philosophical schools. Of M. Comte I have only read a few absurd passages; of M. Littré I only know the beautiful pages you were inspired to write by his rare knowledge and some of his domestic virtues. My philosophy is of the heart and not of the mind, and I give myself up, for instance, to those feelings about eternity which come naturally at the bedside of a cherished child drawing its last breath. At those supreme moments, there is something in the depths of our souls which tells us that the world may be more than a mere combination of phenomena proper to a mechanical equilibrium brought out of the chaos of the elements simply through the gradual action of the forces of matter.
                                    
                                        
                                        Quote in Mondrian's letter to Theo van Doesburg, Amsterdam, 1915; as cited in Letters of the great artists, Richard Friedenthal, Thames and Hudson, London, 1963, p. 234 (transl. Daphne Woodward) 
1910's
                                    
                                        
                                        Quote from the first and only! issue of the art-magazine 'Art Concret', Paris 1930 
1926 – 1931
                                    
Richard Courant in: The Australian Mathematics Teacher, Volumes 39-40 http://books.google.co.in/books?id=CofxAAAAMAAJ, Australian Association of Mathematics Teachers, 1983, p. 3