Spanish design firm Play Studios asked kids to describe what they thought cities would look like in the future, then animated the kid-rendered cities in pop-up book form. There's plenty of fantasy here, but these budding urbanists also have an eye for connected, sustainable, eco-friendly living. Check out the monorails running between buildings in Boscopolis, or the cars in Bright City that run on fallen leaves.

In the making-of video, one girl says of her city, "I just wanted Alicante to have in the future more electric cars, as well as more solar panels to decrease pollution." Hey, the kids really are all right!