Swarmbots (eg multiple robots that act as a swarm) are really cool <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=CJOubyiITsE" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=CJOubyiITsE</a>