"Proun," <a href="//commons.wikimedia.org/wiki/El_Lissitzky" title="El Lissitzky">El Lissitzky</a>,1924
<bdi><a href="https://en.wikipedia.org/wiki/en:El_Lissitzky" class="extiw" title="w:en:El Lissitzky"><span title="Soviet artist, designer, photographer, teacher, typographer and architect (1890–1941)">El Lissitzky</span></a>
</bdi>
CC BY 3.0
Provided by copyright owner of both photograph and artwork