A one-dimensional 4-state <a href="https://en.wikipedia.org/wiki/cyclic_cellular_automaton" class="extiw" title="en:cyclic cellular automaton">en:cyclic cellular automaton</a>, run for 300 steps from a random initial configuration. The <i>i</i>th row of the image shows the state of the automaton after <i>i</i> steps. The boundaries between colored regions in this diagram can be viewed as particles that move left, move right, or remain stationary, and interact with each other when they collide.
<a href="https://en.wikipedia.org/wiki/User:David_Eppstein" class="extiw" title="wikipedia:User:David Eppstein">David Eppstein</a> at <a href="https://en.wikipedia.org/wiki/" class="extiw" title="wikipedia:">English Wikipedia</a>
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