Dimensionalism: Underground City structures

In someways the above art (test print) is influenced by the Low Line concept, although I do have a general interest in structures that are built underground - as cityscapes that venture within cavernous interiors.   If you have seen Interstellar (*SPOILER*) with the end of the movie showing an 'Earth like' duplication via an orbiting space station to house humanity (once Earth becomes uninhabitable).    The image above is more of a homage to future concepts to accommodate the human race, whilst keeping in mind the ensuing future of life on Earth.