Illustration of <a href="https://en.wikipedia.org/wiki/Double_torus" class="extiw" title="en:Double torus">en:Double torus</a>
<a href="//commons.wikimedia.org/wiki/User:Oleg_Alexandrov" title="User:Oleg Alexandrov">Oleg Alexandrov</a>
2007-09-06 05:50
<span class="int-own-work" lang="en">Own work</span>