Always found colony based insects but especially ants fascinating.
Its as if the ant is not the organism but rather the colony is.
Will has also stated that the pheromone system designed for SimAnt was repurposed to be used in The Sims! Very interesting stuff if you ask me :)
(Genuine question, the biggest difference I can think of is most of our cells are in permanent physical contact.)
Not nerve cells. Our post-childhood adult brains persist until we die, so the city of cells (nice image BTW) has a permanent and persistent ruling council, as it were, even if the citizens come and go.