Fractal hybrid of <a href="https://en.wikipedia.org/wiki/Menger_sponge" class="extiw" title="en:Menger sponge">Menger sponge</a> and <a href="https://en.wikipedia.org/wiki/Mandelbulb" class="extiw" title="en:Mandelbulb">Mandelbulb</a>. Can also be called as "Mandelsponge".
<a href="//commons.wikimedia.org/wiki/User:PantheraLeo1359531" title="User:PantheraLeo1359531">PantheraLeo1359531</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>