Thinking nude boy with an early wikipedia symbol :-) around 1910. To be found at the entrance of Friedrich-Paulsen-Gymnasium, Berlin-Steglitz, Gritznerstr 53
<a href="//commons.wikimedia.org/wiki/User:Mutter_Erde" title="User:Mutter Erde">Mutter Erde</a>
Attribution
<span class="int-own-work" lang="en">Own work</span>