Langton's ant inside a box. This animation shows how the ant's path is blocked, but it passes the barrier and continues with its highway pattern. It is thought that this would happen eventually after any path interruption. (See the <a href="https://en.wikipedia.org/wiki/en:Langton%27s_ant" class="extiw" title="w:en:Langton's ant">Wikipedia article</a>).
<a href="//commons.wikimedia.org/wiki/User:SimsContPics" title="User:SimsContPics">SimsContPics</a>
<span class="int-own-work" lang="en">Own work</span>