Santa Fe, Mexico City

The fluctuating divide between rich and poor is a complex matter, but the poverty line quite literally doesn't get much neater than this. Photographer and Anthropologist Johnny Miller has been travelling the world for two years with his drone to document it from above. Here he takes us on a visual tour.

First up, Mexico City (above), where somewhere between 1 and 2 million people live in the cramped poured-concrete homes of low-income housing areas in regions like Ciudad Nezahualcoyotl, right up against the semi-detached homes and manicured lawns of their wealthier neighbours.