Diagram of distance vs. time for the footrace between Achilles and the tortoise. According to Zeno, Achilles can never overtake the tortoise.
<a href="//commons.wikimedia.org/wiki/User:Jochen_Burghardt" title="User:Jochen Burghardt">Jochen Burghardt</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>