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(Click for frequent words.) 74 Kasimir Malevich 73 Kazimir Malevich 69 Suprematism 69 Wassily Kandinsky 68 Kandinsky 67 Suprematist 67 Alexander Rodchenko 66 Vasily Kandinsky 66 Rodchenko 65 Abstract Expressionist 65 Anselm Kiefer 65 Suprematist Composition 64 Natalia Goncharova 64 Constantin Brancusi 64 Baselitz 64 Kurt Schwitters 63 Picasso Braque 63 Constructivist 63 Surrealist 63 Ilya Repin 63 Fernand Léger 63 Erik Bulatov 63 Fauvism 63 Max Beckmann 63 Philip Guston 63 Georges Braque 62 Shchukin 62 Marcel Duchamp 62 Vienna Secession 62 Expressionism 62 figurative painting 62 Dadaists 62 Paul Cézanne 62 Ilya Kabakov 62 Arte Povera movement 62 de Chirico 62 socialist realism 62 abstract expressionists 62 Gerhard Richter 62 Josef Albers 61 Matisse 61 Arshile Gorky 61 Symbolist 61 Laszlo Moholy Nagy 61 Moholy Nagy 61 Gorky 61 German Expressionism 61 Chagall 61 Richard Pousette Dart 61 Naum Gabo 61 René Magritte 61 Eva Hesse 61 Surrealism 61 Russian Constructivism 61 abstract expressionism 61 Constructivism 61 cubists 61 André Breton 61 Vladimir Tatlin 61 Sigmar Polke 61 Cubism 61 Dubuffet 61 Theo van Doesburg 61 Barbizon painters 60 cubism 60 Alexandra Exter 60 Joseph Beuys 60 cubist painter 60 Abstract Expressionists 60 Hans Hofmann 60 Cy Twombly 60 Cubists 60 Rothko 60 Tristan Tzara 60 Paul Klee 60 André Derain 60 Aleksandr Rodchenko 59 abstractionists 59 Mark Rothko 59 Kokoschka 59 de Kooning 59 Alexander Archipenko 59 Pistoletto 59 Sol LeWitt 59 Rauschenberg 59 Expressionists 59 Willem De Kooning 59 Ad Reinhardt 59 German Expressionists 59 Jean Dubuffet 59 German expressionism 59 Oskar Kokoschka 59 Soutine 59 Expressionist painter 59 realist painters 59 Jean Arp 59 Surrealists 59 Magritte 59 Mikhail Larionov 59 Surrealist artist 59 Albert Gleizes 59 Egon Schiele 59 neoclassicism 59 dealer Leo Castelli 59 Karl Schmidt Rottluff 59 Parmigianino 59 Futurism 59 Otto Dix 59 Henri Matisse 59 Franz Kline 59 Abstract Expressionist painting 58 Beuys 58 Jean Léon Gérôme 58 Andre Breton 58 Braque 58 Neoclassicism 58 Adolph Gottlieb 58 Arte Povera 58 Les Demoiselles d' Avignon 58 expressionist painters 58 cubist 58 Edouard Vuillard 58 Boris Grigoriev 58 LeWitt 58 George Grosz 58 Abstract Expressionist painter 58 Brücke 58 Derain 58 Odilon Redon 58 Degas 58 Abstract Expressionism 58 Parisian avant garde 58 Adolf Loos 58 Lenin 58 Gustave Moreau 58 Nevelson 58 Liubov Popova 58 Klimt 58 Leon Bakst 58 Daniel Spoerri 58 Socialist Realist 58 photorealist 58 Dalí 58 David Burliuk 58 Alphonse Mucha 58 Giorgio Morandi 58 conceptualism 58 Martin Kippenberger 58 Wiener Werkstätte 58 Conceptualist 58 Yves Tanguy 58 Enrico Donati 58 Leo Castelli 58 Cézanne 58 Broadway Boogie Woogie 58 Pablo Picasso Andy Warhol 57 Vasarely 57 expressionists 57 Tatlin 57 Kenneth Noland 57 Impression Sunrise 57 George Braque 57 László Moholy Nagy 57 avant gardes 57 Albrecht Durer 57 Honoré Daumier 57 Lucio Fontana 57 El Lissitzky 57 Max Liebermann 57 Georges Rouault 57 Umberto Boccioni 57 Picabia 57 Brancusi 57 Lovis Corinth 57 Mayakovsky 57 Kollwitz 57 Piet Mondrian 57 Rosemarie Trockel 57 Socialist Realism 57 German Expressionist 57 Chaim Soutine 57 Guston 57 Andy Warhol Roy Lichtenstein 57 Hermann Nitsch 57 Lyonel Feininger 57 Marcel Broodthaers 57 Poussin 57 Guercino 57 Joan Miró 57 Joseph Kosuth 57 Hans Arp 57 Sonia Delaunay 57 Fluxus 57 relational aesthetics 57 Modernist 57 Constructivists 57 Vitaly Komar 57 Willem de Kooning 57 Venetian painter 57 Emil Nolde 57 Richard Artschwager 57 avant garde 57 Roy Lichtenstein Andy Warhol 57 Picasso Cezanne 57 Tuymans 57 Picasso 57 Giovanni Battista Piranesi 57 Francis Picabia 57 Sol Lewitt 57 Pointillism 57 Neo Rauch 56 Expressionistic 56 Jean Tinguely 56 Bonnard 56 Gustave Courbet 56 Wifredo Lam 56 expressionist painter 56 geometric abstraction 56 Mannerist 56 Meissonier 56 Vrubel 56 Shishkin 56 Picasso Van Gogh 56 André Kertész 56 Mallarmé 56 Watteau 56 Belgian surrealist 56 French Impressionist painter 56 Minimalism 56 Paul Signac 56 Fauve 56 Rembrandt Vermeer 56 mannerist 56 Max Pechstein 56 Fred Sandback 56 Arcimboldo 56 Kertész 56 Cezanne Matisse 56 Christian Boltanski 56 Pre Raphaelites 56 Gego 56 Georg Baselitz 56 Jan van Eyck 56 Neo Expressionist 56 Pavel Tchelitchew 56 Alexander Melamid 56 Cezanne Picasso 56 Robert Rauschenberg Jasper Johns 56 expressionism 56 Hans Bellmer 56 Käthe Kollwitz 56 Diaghilev 55 German expressionists 55 Robert Delaunay 55 Vuillard 55 representational painting 55 Boccioni 55 Conceptualism 55 Anni Albers 55 Gérôme 55 George Maciunas 55 Alma Tadema 55 Renoir Degas 55 Jules Olitski 55 Gabriel Orozco 55 Albert Oehlen 55 Marc Chagall 55 artist Joseph Beuys 55 Der Blaue Reiter 55 Pissarro 55 expressionist 55 Abstract Expressionist painters 55 Miró 55 Édouard Manet 55 Jacques Lipchitz 55 Alighiero Boetti 55 Rembrandt van Rijn 55 Frans Hals 55 Richard Anuszkiewicz 55 Dürer 55 Robert Rauschenberg 55 Sots Art 55 de Chavannes 55 Giacometti 55 Edouard Manet 55 Monet Pissarro 55 Josef Hoffmann 55 Jacques Callot 55 Pierre Soulages 55 Albrecht Dürer 55 Ghirlandaio 55 Warhol Lichtenstein 55 Duchamp 55 Sergei Shchukin 55 Dadaism 55 De Kooning 55 Kathe Kollwitz 55 Matisse Picasso 55 Piero della Francesca 55 Ileana Sonnabend 55 Brueghel 55 Balthus 55 abstract expressionist painter 55 surrealists 55 Rubens Rembrandt 55 sculptor Constantin Brancusi 55 Italian Futurists 55 Fernand Leger 55 Meyerhold 55 Kitaj 55 Louise Nevelson 55 dealer Ambroise Vollard 55 Alexej von Jawlensky 55 Lissitzky 55 Flemish painter 55 Hans Memling 55 Francesco Guardi 55 Lenin Trotsky 55 Giacomo Balla 55 Warhol 54 Johannes Vermeer 54 abstract painters 54 Van Gogh Gauguin 54 Giovanni Bellini 54 Artschwager 54 Luc Tuymans 54 Jawlensky 54 nonobjective 54 Dadaist 54 geometric abstractions 54 Eugène Delacroix 54 Mussorgsky 54 Daumier 54 André Masson 54 Henri Fantin Latour 54 catalog raisonné 54 Dosso Dossi 54 Pollock de Kooning 54 Eduardo Chillida 54 Jugendstil 54 Impressionism 54 Reclining Nude 54 Fauvist 54 abstractionist 54 Leonora Carrington 54 Pre Raphaelite Brotherhood 54 Conceptual Art 54 Jasper Johns Robert Rauschenberg 54 Impressionist painters 54 Expressionist 54 Clyfford Still 54 figuration 54 Konstantin Korovin 54 Boetti 54 RB Kitaj 54 Courbet 54 Lipchitz 54 Ruscha 54 Demoiselles 54 Modernism 54 neo expressionist 54 Theodor Adorno 54 Freud 54 Nicolas Poussin 54 Rudolf Stingel 54 Flemish painters 54 Manet Monet 54 Pousette Dart 54 Alexandre Benois 54 Menil 54 Diaghilev Ballets Russes 54 Basquiat 54 neo Classicism 54 modernist painters 54 Piero Manzoni 54 constructivist 54 Picasso Kandinsky 54 VI Lenin 54 Jasper Johns 54 Isamu Noguchi 54 Walter Hopps 54 Atget 54 fauvism 54 Gino Severini 54 Picasso Modigliani 54 Social Realism 54 Sergei Diaghilev 54 Neo Impressionism 54 Henri Matisse Pablo Picasso 54 Romanian sculptor Constantin 54 Bauhaus 54 Degas Manet 54 Neue Galerie 53 Rembrandt Caravaggio 53 Mimmo Paladino 53 Guido Reni 53 Frankenthaler 53 surrealist 53 Symbolists 53 Cady Noland 53 Netherlandish 53 Pontormo 53 Alfred Kubin 53 Andrea Mantegna 53 Degas Monet 53 French Impressionists 53 Edgar Degas 53 Ivan Morozov 53 Neue Nationalgalerie 53 Signac 53 Arnulf Rainer 53 Durer 53 artist Marcel Duchamp 53 Romare Bearden 53 arte povera 53 Aubrey Beardsley 53 Aivazovsky 53 Logvinenko 53 Bouguereau 53 constructivism 53 AR Penck 53 Xavier Veilhan 53 fauvist 53 Gauguin Van Gogh 53 modernist painter 53 symbolist 53 Giacometti sculptures 53 Rene Magritte 53 Dan Flavin 53 Filippo Lippi 53 Schnittke 53 Andre Derain 53 Larry Poons 53 German expressionist 53 Andrea del Sarto 53 Picasso Klee 53 Géricault 53 Sofia Gubaidulina 53 Leonardo Michelangelo 53 Neo Impressionist 53 Esteban Vicente 53 van Goghs 53 Vladimir Ilyich Lenin 53 Leon Kossoff 53 Roland Barthes 53 Béla Bartók 53 Romanticism 53 Annibale Carracci 53 James Rosenquist 53 Keith Haring 53 Situationist International 53 Neo Classical 53 Vassily Kandinsky 53 Walter Gropius 53 Lee Krasner 53 Fluxus movement 53 Fauves 53 cellist Mstislav Rostropovich 53 Japonisme 53 Immendorff 53 Modernist painter 53 Erich Heckel 53 Matisses 53 Dzerzhinsky 53 Leonor Fini 53 Russian Constructivist 53 Memling 53 Social Realist 53 Amadeo Modigliani 53 Picasso Les Demoiselles 53 Yan Pei Ming 53 Diego Velázquez 53 Picasso Dali 53 Kabakov 53 Camille Corot 53 Raoul Dufy 53 Miriam Schapiro 53 Cézannes 53 Tony Cragg 53 composer Modest Mussorgsky 53 Van Gogh Picasso 53 JMW Turner 53 Buchloh 53 writer Maxim Gorky 53 Beethoven Frieze 53 Corot 53 Amedeo Modigliani 53 Classicism 53 Eugene Atget 53 Auguste Rodin 53 Diebenkorn 53 Guy Debord 53 modernist 53 Breughel 53 Cubism Futurism 53 Teniers 52 Modigliani 52 Marinetti 52 Leonard Baskin 52 French impressionists 52 semiabstract 52 Cezanne Renoir 52 Willem DeKooning 52 Degas Renoir 52 Russian Constructivists 52 Persian poet Rumi 52 Serge Diaghilev 52 Les Demoiselles 52 Masaccio 52 Vanitas 52 Simone Weil 52 Sandro Chia 52 François Boucher 52 Ashcan School 52 Salvador Dalí 52 serialism 52 Van Doesburg 52 impressionism 52 Vollard 52 Jonathan Meese 52 Cezanne Degas 52 Odd Nerdrum 52 Dominique Ingres 52 Oehlen 52 documenta 52 Alfred Schnittke 52 Nancy Spero 52 Nicolas Bourriaud 52 Brice Marden 52 Andre Lhote 52 Dorothea Tanning 52 Wolfgang Tillmans 52 modernism 52 Viennese composer 52 Tomma Abts 52 Neoclassical 52 George Inness 52 Tiepolo 52 Anthony van Dyck 52 Girodet 52 Douglas Huebler 52 Charles Sheeler 52 Hélio Oiticica 52 Jörg Immendorff 52 neo classicism 52 artist Marc Chagall 52 Ruisdael 52 Manet Degas 52 Figurative 52 philosopher Ludwig Wittgenstein 52 Lee Bontecou 52 Giambologna 52 Allan Kaprow 52 symbolist painter 52 Pablo Picasso 52 Ludovico Carracci 52 de Koonings 52 Pablo Picasso Henri Matisse 52 Claes Oldenburg 52 Ferdinand Hodler 52 Oiticica 52 Picasso Cubist 52 Kai Althoff 52 Bruce Nauman 52 composer Dmitri Shostakovich 52 Foujita 52 neo dada 52 realist painter 52 Maurice Utrillo 52 Helen Frankenthaler 52 Surrealist painter 52 cubist painting 52 Rothko paintings 52 Olitski 52 Frédéric Chopin 52 Städel Museum 52 abstract expressionist 52 Tintoretto 52 Avant garde 52 Mehretu 52 Serge Lifar 52 Pierre Bonnard 52 Guelman Gallery 52 de Toulouse Lautrec 52 Ed Kienholz 52 Renoir Cezanne 52 Hans Hartung 52 Franz Xaver Messerschmidt 52 Formalism 52 Samodurov 52 HC Westermann 52 Luciano Berio 52 Gemäldegalerie 52 Zarobell 52 Impressionist painter 52 Arnold Schönberg 52 Antonio Gramsci 52 Photorealism 52 Oskar Schlemmer 52 Giovanni Battista Tiepolo 52 Schirn Kunsthalle Frankfurt 52 Joaquín Sorolla 52 Martin Buber 52 Picasso Chagall 52 Ludwig Wittgenstein 52 Monet Matisse 51 Städel 51 Félix Vallotton 51 Mark Grotjahn 51 Mazepa 51 Seagram murals 51 Grisey 51 Jessica Stockholder 51 Herzen 51 monumental sculptures 51 Camille Pissarro 51 Alice Neel 51 painter Piet Mondrian 51 Feininger 51 Art Nouveau 51 Pina Bausch 51 Paul Thek 51 Brassaï 51 Brancusi sculpture 51 Lynda Benglis 51 Hedda Sterne 51 Frederick Kiesler 51 Picasso Miró 51 Peggy Guggenheim 51 Medardo Rosso 51 Leonardo Mona Lisa 51 Ivan Aivazovsky 51 neo Classical 51 Andre Kertesz 51 Ben Shahn 51 Estorick 51 Eifman 51 Pushkin Museum 51 Pollock drip 51 Large Bathers 51 Charles Baudelaire 51 YBAs 51 Nicolas de Stael 51 serialist 51 Chillida 51 Gaugin 51 Berthe Morisot 51 aquatint 51 Sophie Taeuber Arp 51 Alexander Calder 51 Paul Poiret 51 Zurab Tsereteli 51 Leon Golub 51 Gustav Klimt 51 Ullens Collection 51 Chernikhov 51 On Kawara 51 Tino Sehgal 51 Yevtushenko 51 Sandro Botticelli 51 artist Romare Bearden 51 Wilhelm Furtwaengler 51 French impressionist painter 51 artworld 51 MUMOK 51 Louise Bourgeois 51 Ernst Ludwig Kirchner 51 Blaue Reiter 51 Repin 51 Degenerate Art 51 Jean Baptiste Greuze 51 Martin Johnson Heade 51 Elie Nadelman 51 Dali Picasso 51 Matisse Chagall 51 Rembrandt Van Rijn 51 Carl Menger 51 hyper realist 51 Isadora Duncan 51 Huma Bhabha 51 Charlotte Perriand 51 Zsolnay 51 Museo Ideale 51 preparatory drawings 51 Camille Pissaro 51 Woman Ironing 51 impressionist painters 51 Scriabin 51 Picasso Demoiselles d' Avignon 51 Amy Sillman 51 Picasso Guernica 51 Tretyakov Gallery 51 Die Brücke 51 Dieter Roth 51 Vermeers 51 Victor Vasarely 51 Picasso Monet 51 Italian Futurism 51 Howard Finster 51 Bartók 51 Michelangelo Buonarroti 51 Pre Raphaelite painter 51 Gauguin 51 Andrea Palladio 51 Francis Bacon 51 Beauford Delaney 51 Konstantin Melnikov 51 Goltzius 51 Hölderlin 51 Sperone Westwater 51 Giulio Romano 51 monographic 51 Shafrazi 51 John Baldessari 51 Somov 51 architect Walter Gropius 51 Francesco Clemente 51 Alexander Scriabin 51 Akhmatova 51 Wilfredo Lam 51 Reuven Rubin 51 Mexican muralist 51 Persian miniatures 51 Theodore Gericault 51 DeKooning 51 Lévi Strauss 51 Fra Filippo Lippi 51 drypoint 51 Duerer 50 Daniel Buren 50 neo expressionism 50 Action Abstraction 50 Bolshevik revolution 50 surrealist paintings 50 Ter Borch 50 Mattia Preti 50 Kropotkin 50 abstract painting 50 Josef Hofmann 50 Lassnig 50 Gluts 50 Pablo Picasso Marc Chagall 50 reclining nudes 50 Elaine de Kooning 50 Henry Darger 50 David Alfaro Siqueiros 50 Delaroche 50 Rosa Luxemburg 50 Domenichino 50 Burliuk 50 Cezanne 50 Minimalists 50 Dante Gabriel Rossetti 50 Kounellis 50 Quattrocento 50 abstractionism 50 Harald Szeemann 50 Pissaro 50 composer Felix Mendelssohn 50 Königsberg 50 Lincoln Kirstein 50 Mark di Suvero 50 Impressionists 50 Peter Voulkos 50 Giovanni Boldini 50 Tamara de Lempicka 50 abstract sculptures 50 Arnold Schoenberg 50 Konstantin Stanislavsky 50 Ballets Russes 50 modernists 50 Artaud 50 avant gardists 50 Andy Warhol 50 Carracci 50 Thomas Rowlandson 50 Carolee Schneemann 50 Jacques Villon 50 Paul Cezanne 50 Julian Onderdonk 50 Vonnoh 50 Abramović 50 Bruno Taut 50 art brut 50 Manet 50 nonrepresentational 50 Surikov 50 Mensheviks 50 painter Marc Chagall 50 Henri Gaudier Brzeska 50 impresario Sergei Diaghilev 50 Brassai 50 Saint Phalle 50 Exposition Universelle 50 Leonide Massine 50 Piranesi 50 Luigi Russolo 50 Situationists 50 Arthur Szyk 50 Ambroise Vollard 50 Raphael Soyer 50 Andy Warhol Marilyn 50 Rothkos 50 composer Dmitry Shostakovich 50 Rodin 50 Hieronymous Bosch 50 Berenice Abbott 50 Neo Classicism 50 dealer Jacques Goudstikker 50 Cioran 50 overpainting 50 Jean François Millet 50 Juan Gris 50 canvases 50 abstract expressionist painters 50 Sergei Eisenstein 50 mezzotints 50 Richard Diebenkorn 50 Paula Modersohn Becker 50 composer Arnold Schoenberg 50 Julia Kristeva 50 van Meegeren 50 Michelangelo Merisi da Caravaggio 50 Hilla Becher 50 SH Raza 50 Pulcinella Suite 50 Nussimbaum 50 Rackstraw Downes 50 Artemisia Gentileschi 50 Nandalal Bose 50 Marlene Dumas 50 Entartete Kunst 50 Alban Berg 50 Monet Renoir 50 Ferus Gallery 50 Karl Friedrich Schinkel 50 de Heem 50 artist Josef Albers 50 Garry Winogrand 50 Kunstmuseum Basel 50 formalist 50 Kunsthistorisches Museum 50 Honore Daumier 50 Moderna Museet 50 Rembrandt 50 painter Gustav Klimt 50 philosopher Immanuel Kant 50 Eugène Boudin 50 Dmitri Shostakovich 50 Sherrie Levine 50 Pat Steir 50 Mel Bochner 50 Lucien Freud 50 Sottsass 50 Jasper Johns Roy Lichtenstein 50 Marie Thérèse Walter 50 Frantisek Kupka 50 artist Sol LeWitt 50 easel painting 50 figurative painter 50 Roni Horn 50 Alberto Burri 50 Dexter Dalwood 50 masterpieces 50 Ab Ex 50 composer Gustav Mahler 50 Karlheinz Stockhausen 50 Monet paintings 50 Frederic Remington 50 Vija Celmins 50 Zeng Fanzhi 50 paintings 50 conceptualist 50 Fred Tomaselli 50 Genzken 50 Berliner Strassenszene 50 Slav Epic 50 Potato Eaters 50 Mashkov 50 Giorgio De Chirico 50 CoBrA 50 Konchalovsky 50 abstract impressionism 50 Cranach 50 Górecki 50 Ralph Eugene Meatyard 50 painterliness 50 Joan Miro 50 William Adolphe Bouguereau 50 Georges Seurat 50 Michelangelo Pistoletto 50 Nikolai Medtner 50 Audrey Flack 50 Akbar Padamsee 50 medieval illuminated manuscripts 50 Marie Laurencin 50 Maillol 50 Vilna Gaon 50 d' Avignon 50 Robert Mapplethorpe 50 Mannerism 50 Pietro da Cortona 50 Anna Akhmatova 50 Josiah McElheny 50 Gerrit Rietveld 50 Mehmed II 50 Cocteau 49 Webern 49 Ugo Rondinone 49 Charles Demuth 49 abstract geometric 49 Pablo Picasso Joan Miro 49 Julie Mehretu 49 Titian Rubens 49 Kunsthaus 49 Art Nouveau painter 49 Pre Raphaelite 49 Renoir Van Gogh 49 ukiyo e 49 Edgard Varèse 49 Chiparus 49 Pushkin 49 Zuckerkandl 49 Henri Cartier Bresson 49 Boulez 49 Pierre Bourdieu 49 Luigi Nono 49 Lepeshinskaya 49 Karl Blossfeldt 49 Tchelitchew 49 abstract impressionist 49 Utrillo 49 Zhang Daqian 49 gestural abstraction 49 Plekhanov 49 Taneyev 49 Japanese woodblock prints 49 Petrograd 49 Kurtag 49 Francisco Goya 49 Mexican muralists 49 Sonnabend Gallery 49 Leon Battista Alberti 49 Hannah Arendt 49 avant gardist 49 Maryinsky 49 Renaissance painters 49 Roman poet Ovid 49 Voulkos 49 Poincaré 49 Whiteread 49 Picasso Ambroise Vollard Patron 49 artist Albrecht Durer 49 Henri Toulouse Lautrec 49 hyperrealist 49 Maurice de Vlaminck 49 Spanish surrealist painter 49 Alexander Blok 49 Ohhh Alright 49 Hilla Rebay 49 Jamini Roy 49 Vaslav Nijinsky 49 Philip Pearlstein 49 Enescu 49 artist Anselm Kiefer 49 Avigdor Arikha 49 Moses Mendelssohn 49 Peter Kropotkin 49 Dufy 49 James McNeill Whistler 49 Emilia Kabakov 49 William Zorach 49 Borromini 49 Barbara Hepworth 49 Jean Michel Basquiat 49 Vollard Suite 49 Mikhail Nesterov 49 Guelman 49 Fang Lijun 49 Hanns Eisler 49 Bolsheviks 49 Alfons Mucha 49 Le Repos 49 Roberto Matta 49 Giorgio Vasari 49 Eric Fischl 49 Bourriaud 49 Gershom Scholem 49 Abanindranath Tagore 49 Daubigny 49 Bikash Bhattacharjee 49 Cartier Bresson 49 Max Horkheimer 49 Painterly 49 conceptualists 49 Cezannes 49 artist Pavel Tchelitchew 49 Zhang Huan 49 philosopher Georg Wilhelm