<a href="https://en.wikipedia.org/wiki/Otto-Herbert_Hajek" class="extiw" title="w:Otto-Herbert Hajek">Otto-Herbert Hajek</a>: "Farbe flügelt im Raum", 2002, am Funkhaus des SWR in Stuttgart
<a href="//commons.wikimedia.org/wiki/User:Pjt56" title="User:Pjt56">Pjt56</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>