The <a href="https://en.wikipedia.org/wiki/Brinkmann_graph" class="extiw" title="en:Brinkmann graph">Brinkmann graph</a>
<a href="//commons.wikimedia.org/wiki/User:David_Eppstein" class="mw-redirect" title="User:David Eppstein">David Eppstein</a>
2010-07-23
<span class="int-own-work" lang="en">Own work</span>, drawn using the <a rel="nofollow" class="external text" href="https://11011110.github.io/blog/2010/07/23/graph-drawing-acceptances.html">Lombardi Spirograph</a>