The <a href="https://en.wikipedia.org/wiki/binary_tiling" class="extiw" title="en:binary tiling">binary tiling</a> of the <a href="https://en.wikipedia.org/wiki/hyperbolic_plane" class="extiw" title="en:hyperbolic plane">hyperbolic plane</a>, with straight-sided tiles
<a href="//commons.wikimedia.org/wiki/User:David_Eppstein" class="mw-redirect" title="User:David Eppstein">David Eppstein</a>
<span class="int-own-work" lang="en">Own work</span>