Mosaic of <a href="https://de.wikipedia.org/wiki/Otto_Trubel" class="extiw" title="de:Otto Trubel">Otto Trubel</a> at a community residential building, 3rd district of Vienna
<a href="//commons.wikimedia.org/wiki/User:P_e_z_i" title="User:P e z i">P e z i</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>