<a href="https://en.wikipedia.org/wiki/Christoff_Schissler" class="extiw" title="en:Christoff Schissler">Christoph Schissler</a>, gilded brass geometric square,  Augsburg, 1569.
<p>Mater: Height = 35,6 cm; Width = 35,6 cm; Depth = 1,1 cm 
</p>
Mathematisch-Physikalischer Salon, C I 1
<a href="//commons.wikimedia.org/wiki/User:Ad_Meskens" title="User:Ad Meskens">Ad Meskens</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>