I'm not entirely sure what the actual definition of a city is. It's a thought-provoking question. To me, an enclave of 10,000 people that is engaged in everything from the creation of fine art to smelting of ore would by its very nature be complex, as would a cohesive social system of enforced egalitarianism of that large a number of people.

Here's this from the World Atlas: "Different countries in the world have different demographics and geographical definitions for cities.In Sweden and Denmark, a settlement of more than 200 people forms a town, whereas Australia and Canada have set a minimum of 1,000 people to make a town. This figure varies in France and Israel who have set a minimum of 2,000 people to make a city. In the US and Mexico, a city should have at least 2,500 people, compared to Japan where cities must have at least 30,000 people."

In other words, like so much in the world, it seems to be in the eye of the beholder. I'm in no doubt at all that much of the bible is an attempt to explain humans as unique within creation, although I hadn't necessarily thought of it in quite that way before. I'll look for that piece.