PROUN C1. El Lissintzky. Óleo sobre tabla. 68 x 68 cm. Museo Thyssen-Bornemisza, Madrid

http://www.museothyssen.org/img/obras_descarga/1988.20.jpg

Lithograph from a portfolio of eleven lithographs with unique manuscript manifesto in Russian and German, colophon, and front and back covers of gouache, ink and pencil

https://www.moma.org/collection/works/165513?locale=es

https://uploads7.wikiart.org/images/el-lissitzky/proun-1-c-1919.jpg!Large.jpg