Langton's ant
From Tardis Wiki, the free Doctor Who reference
Langton's ant was a two-dimensional, four stage simulation with simple rules that resulted in complex patterns. Ro-Jedda used the principle with Deliverables to gain control of the Rift (AUDIO: Zero Hour) after Bilis Manger disrupted it to send a message (AUDIO: A Kill to a View) to God. (AUDIO: Herald of the Dawn)
Orr learnt of the simulation as her first human owner liked them to talk about such things whilst wearing bunny ears. (AUDIO: Zero Hour)