The WTC3 (left) and WTC1 (right) buildings, as seen through the “Oculus” structure in the foreground, of the World Trade Center transportation hub. Below: The WTC3 building alone.
High density housing in Hongkong. August 2015. You can’t visit Hongkong without being stunned, irritated, fascinated by what many refer to as “ batteries” for humans. For more: Photographer Michael Wolf did a comprehensive study called Architecture of Density about the urban structures.