Heinz Mack (* 1931), founder of <a href="//commons.wikimedia.org/w/index.php?title=Zero&amp;action=edit&amp;redlink=1" class="new" title="Zero (page does not exist)">Zero</a>; Esposition Mueum Ludwig, Koblenz, 2009
<a href="//commons.wikimedia.org/wiki/User:Warburg" title="User:Warburg">Warburg</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>