In topology there is the notion of an *infinite spider's web* in the (complex) plane $\mathbb C$ that was introduced in 2010 https://arxiv.org/pdf/1009.5081.pdf.

A set $E\subseteq \mathbb C$ is an infinite spider’s web if $E$ is connected and there
exists a sequence of bounded simply connected domains $(G_n)$ with 

 - $G_n \subset G_{n+1}$, 
 - $\partial G_n\subset E$, and 
 - $\bigcup _{n\in \mathbb N}G_n = \mathbb C$.

In certain cases we also have that $E$ is closed and nowhere dense, and each $\partial G_n$ is a simple closed curve (Jordan curve), so that $E$ more closely resembles a traditional spider's web.  These sets can be generated by iteration of entire functions such as  $f(z)=\frac{1}{2}(\cos z^{1/4}+\cosh z^{1/4})$. The image below shows a spider's web consisting of the points $z\in \mathbb C$ such that $f^n(z)\to\infty$ at a certain rate (see https://arxiv.org/pdf/1009.5081.pdf for details).  
 
Every locally connected Julia set of a transcendental entire function also has this form (shown in https://arxiv.org/pdf/1110.3256.pdf).

[![enter image description here][1]][1]



  [1]: https://i.sstatic.net/BiBD1.png