It&#x27;s a reference to this : Turtles all the way down<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Turtles_all_the_way_down" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Turtles_all_the_way_down</a>