Logo of the Heinzenwies Gymnasium, <a href="https://en.wikipedia.org/wiki/Idar-Oberstein" class="extiw" title="en:Idar-Oberstein">Idar-Oberstein</a>, Germany
<a href="//commons.wikimedia.org/wiki/User:Lirion" title="User:Lirion">Lirion</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span> &amp; <a rel="nofollow" class="external text" href="http://www.heinzenwies.de">school web site</a>