Volume visualization of cellular automata simulation of evolution by <a href="https://en.wikipedia.org/wiki/Jack_Corliss" class="extiw" title="w:Jack Corliss">Jack Corliss</a>. Vertical axis represents time (moving down); horizontal axes represent speciation (variations in 2 characteristics, in this case).
<a href="//commons.wikimedia.org/wiki/User:Davepape" title="User:Davepape">Dave Pape</a> (while NASA employee)
<span class="int-own-work" lang="en">Own work</span>