Bois (1988): "the Chagallian Lissitzky of early 1919, the Suprematist Lissitzky of the 1920s and the "Stalinist" Lissitzky of '30s propaganda work. ... the Chagallian Lissitzky bears no relation to the Suprematist, and ... this second Lissitzky is only accidentally (biographically) linked to the third Lissitzky. ... Lissitzky the Jewish militant, Lissitzky the Suprematist, the functionalist advisor, the advertisement designer, the Soviet propagandist, the theoretician of abstract art-these are only a few of his numerous identities. Should we regard this diversity as part of his message, as if Lissitzky were saying that the modern artist must be a protean kaleidoscope?" Bois, Yve-Alain (April 1988). "El Lissitzky: Radical Reversibility". Art in America: 160–181. Retrieved 13 October 2022.
Marc Chagall, My Life (New York: Orion, 1960), 142, cited in Ziva Amishai-Maisels, Chagall and the Jewish Revival: Center or Periphery, Tradition and Revolution, 85, n. 94. See also Harshav, Marc Chagall and His Times, 271–272, 275, n. 53. cited in Goldman-Ida (2014), footnote 48. Goldman-Ida, Batsheva (2014). Alois Breyer, El Lissitzky, Frank Stella—Wooden Synagogues. Tel Aviv Museum of Art. ISBN978-965-539-097-1.
Estraikh, Hoge & Krutikov (2016, pp. 79–85): Described as a "classic example of Mani Leib's children's poetry", the book concerns a little boy, a yingl, called Tsingl Khvat. The boy has courage and a sharp tongue (tsingl). Thus, his name is not only a personal name, but also a reference to his character: He is a khvat, i.e. a rascal and jack of all trades." Estraikh, Gennady; Hoge, Kerstin; Krutikov, Mikhail (2016). Children and Yiddish Literature From Early Modernity to Post-Modernity. Routledge. ISBN978-1-317-19879-6. Retrieved 14 September 2022.
Forgács wrote that "Not surprisingly, Bucholz—stunned at the sight of Proun room and feeling betrayed by Lissitzky who, as he put it, "knew my 1922 studio room well" ... Perloff & Reed (2003, p. 68) Perloff, Nancy; Reed, Brian, eds. (2003). Situating El Lissitzky: Vitebsk, Berlin, Moscow. Getty Publications. ISBN978-0-89236-677-4. Retrieved 9 August 2022.
Dukhan (2007) states that "in his early, formative years Lissitzky found himself in a vibrant "multicultural" mixture of Jewish and non-Jewish traditions and modernity, post-Haskalah and Orthodoxy, bourgeois cultural comfort and pre-revolutionary inspiration." Dukhan, Igor (2007). "El Lissitzky – Jewish as Universal: From Jewish Style to Pangeometry"(PDF). Ars Judaica: Journal of Jewish Art. 3.
Dukhan (2007): "Lissitzky is always between – between a Jewish search for style and cultural identity and the universal language of Suprematism, between Suprematism and Constructivism, between Malevich's concept of abstract non-objectivity and De Stijl, between "Constructivism" and Dada, and last, between the world of Vitebsk, the west-Russian provincial center – and Darmstadt, Moscow, Kiev, Berlin, Hanover, and imaginary America." Dukhan, Igor (2007). "El Lissitzky – Jewish as Universal: From Jewish Style to Pangeometry"(PDF). Ars Judaica: Journal of Jewish Art. 3.
Nisbet determined that Lissitzky coined the name, Proun, around spring of 1921. Nisbet (1995b, p. 82) Nisbet, Peter (1995b). "El Lissitzky and the New Culture". Experiment. 1 (1): 257–264. doi:10.1163/2211730X-00101020.
Levinger (1987) shows this comparison: "The study of Lissitzky's comparison of art to games in the light of Wittgenstein's language-games is advantageous especially when we turn to analyse the Prouns. According to Wittgenstein, language is a game because the practice of language is inside a pattern of activity understood or accepted by a community of people. Wittgenstein compared the sound or shape of a word to a chessman; the word by itself is dead, a mere noise, just as the chess-piece, by itself, is only carved wood. What makes the carved wood into a king or a queen is the existence of the practice of playing chess, just as the practice of playing one or another language-game turns a sound into a word. Lissitzky's games with forms and colors are art-games because his playing with proportions, symmetry, vanishing point perspective and with the fore, mid and back planes of the picture are games inside the practice of Western art. Without the accepted tradition of Renaissance art the Prouns would be meaningless." Levinger, Esther (1987). "El Lissitzky's art-games"(PDF). Neohelicon. 14 (1): 177–191. doi:10.1007/bf02093026. Retrieved 9 August 2022.
Kamczycki 2022. Kamczycki, Artur (2022). "Soviet art and Kabbalah, the story behind El-Lissitzky's Self-Portrait". Journal of Modern Jewish Studies. 21 (3): 342–364. doi:10.1080/14725886.2021.1959145.
Mileeva 2015. Mileeva, Maria (2015). "The Artist as a Cultural Emissary across the Borders of Interwar Europe: The Case of El Lissitzky". Der Künstler in der Fremde: 219–240. doi:10.1515/9783050090214-012.
Difford 1997. Difford, Richard J. (1997). "Proun: an exercise in the illusion of four-dimensional space". The Journal of Architecture. 2 (2): 113–144. doi:10.1080/136023697374487.
Dukhan & Lodder 2016. Dukhan, Igor; Lodder, Christina (2016). "Visual Geometry: El Lissitzky and the Establishment of Conceptions of Space–Time in Avant-garde Art". Art in Translation. 8 (2): 194–220. doi:10.1080/17561310.2016.1216050.
Levinger 1989. Levinger, Esther (1989). "Art and Mathematics in the Thought of El Lissitzky: His Relationship to Suprematism and Constructivism". Leonardo. 22 (2): 227–236. doi:10.2307/1575236. JSTOR1575236.
Corrada 1992. Corrada, Manuel (1992). "On Some Vistas Disclosed by Mathematics to the Russian Avant-Garde: Geometry, El Lissitzky and Gabo". Leonardo. 25 (3/4): 377–384. doi:10.2307/1575865. JSTOR1575865.
Larson (1976) writes "I once heard a crank art historian remark that this figure was the new Renaissance man, since his stance is something like the guy in Leonardo's famous drawing, but there isn't any circle in the Lissitzky, since obviously a circle could here be confused with the sun." Larson, Philip (1976). "El Lissitzky's "Victory Over The Sun"". The Print Collector's Newsletter. 7 (1): 10–11. ISSN0032-8537. JSTOR44130035.
Levinger 1989. Levinger, Esther (1989). "Art and Mathematics in the Thought of El Lissitzky: His Relationship to Suprematism and Constructivism". Leonardo. 22 (2): 227–236. doi:10.2307/1575236. JSTOR1575236.
Corrada 1992. Corrada, Manuel (1992). "On Some Vistas Disclosed by Mathematics to the Russian Avant-Garde: Geometry, El Lissitzky and Gabo". Leonardo. 25 (3/4): 377–384. doi:10.2307/1575865. JSTOR1575865.
Gough 2014. Gough, Maria (2014). "Lissitzky on Broadway"(PDF). In Abbaspour, Mitra; Daffner, Lee Ann; Hambourg, Maria Morris (eds.). Object:Photo. Modern Photographs: The Thomas Walther Collection 1909–1949. An Online Project of The Museum of Modern Art. New York: The Museum of Modern Art.
Lodder 2014. Lodder, Christina (2014). "Revolutionary Photography"(PDF). In Abbaspour, Mitra; Daffner, Lee Ann; Hambourg, Maria Morris (eds.). Object:Photo. Modern Photographs: The Thomas Walther Collection 1909–1949. An Online Project of The Museum of Modern Art. New York: The Museum of Modern Art.
Pollmeier 2014. Pollmeier, Klaus (2014). "El Lissitzky's Multilayer Photographs: A Technical Analysis."(PDF). In Abbaspour, Mitra; Daffner, Lee Ann; Hambourg, Maria Morris (eds.). Object:Photo. Modern Photographs: The Thomas Walther Collection 1909–1949. An Online Project of The Museum of Modern Art. New York: The Museum of Modern Art.
Frizot 2014. Frizot, Michel (2014). "The Poetics of Eye and Lens"(PDF). In Abbaspour, Mitra; Daffner, Lee Ann; Hambourg, Maria Morris (eds.). Object:Photo. Modern Photographs: The Thomas Walther Collection 1909–1949. An Online Project of The Museum of Modern Art. New York: The Museum of Modern Art.
Levinger (1987) shows this comparison: "The study of Lissitzky's comparison of art to games in the light of Wittgenstein's language-games is advantageous especially when we turn to analyse the Prouns. According to Wittgenstein, language is a game because the practice of language is inside a pattern of activity understood or accepted by a community of people. Wittgenstein compared the sound or shape of a word to a chessman; the word by itself is dead, a mere noise, just as the chess-piece, by itself, is only carved wood. What makes the carved wood into a king or a queen is the existence of the practice of playing chess, just as the practice of playing one or another language-game turns a sound into a word. Lissitzky's games with forms and colors are art-games because his playing with proportions, symmetry, vanishing point perspective and with the fore, mid and back planes of the picture are games inside the practice of Western art. Without the accepted tradition of Renaissance art the Prouns would be meaningless." Levinger, Esther (1987). "El Lissitzky's art-games"(PDF). Neohelicon. 14 (1): 177–191. doi:10.1007/bf02093026. Retrieved 9 August 2022.
Nisbet (1995a, pp. 262–265) describes Kandinsky's room as "octagonal in shape, with entrances in three of the longer walls (two in the middle, one off-center). His designs completely covered these walls, with the exception of a white band at the base and around the entrances. With no framing devices, the composition's black background flowed uninterruptedly across the corners, although each wall was treated as a defined unit, with no painted form actually crossing a corner." Nisbet, Peter (1995a). El Lissitzky in the Proun years: A study of his work and thought, 1919-1927 (PhD thesis). Yale University.
Estraikh, Hoge & Krutikov (2016, pp. 79–85): Described as a "classic example of Mani Leib's children's poetry", the book concerns a little boy, a yingl, called Tsingl Khvat. The boy has courage and a sharp tongue (tsingl). Thus, his name is not only a personal name, but also a reference to his character: He is a khvat, i.e. a rascal and jack of all trades." Estraikh, Gennady; Hoge, Kerstin; Krutikov, Mikhail (2016). Children and Yiddish Literature From Early Modernity to Post-Modernity. Routledge. ISBN978-1-317-19879-6. Retrieved 14 September 2022.
Larson (1976) writes "I once heard a crank art historian remark that this figure was the new Renaissance man, since his stance is something like the guy in Leonardo's famous drawing, but there isn't any circle in the Lissitzky, since obviously a circle could here be confused with the sun." Larson, Philip (1976). "El Lissitzky's "Victory Over The Sun"". The Print Collector's Newsletter. 7 (1): 10–11. ISSN0032-8537. JSTOR44130035.