I really love the all the detail that you have captured in the city and the rooftops. I'm really curious to know how you did it. I can see some of the same elements in City concept 2. so is this a custom brush that you are using or photo manipulation with some over painting? I would love to know.
To me, they are towering arcologies, high-tech buildings looming over the fields that provide them their food and raw materials.
At the same time, though, they could be giant natural rock formations, a gathering place for the widespread urban area clustered around their base.
Either way, it's a fantastic image. Thanks for sharing.