Late in Den Hartog’s graduate studies during the 1980’s, the artist built a floating platform in an empty gallery space that semi-precisely mirrored the surface area of that very space. Titled “Walk Around, Roll Around,” the installation consisted of hundreds of pounds of cast plaster with one pathway around the perimeter of the piece that could be traversed giving a sense of solidity to the otherwise open floorplan. This reorienting divination of form, an early but pivotal impetus, would prove foundational. The “unplatted space” of the exhibition’s title is, Den Hartog writes, “land that hasn’t been divided into legal lots through a formal, recorded subdivision map. Instead of using lot and block numbers, boundaries for unplatted land are typically described using specific measurements and directions, often called ‘metes and bounds.’” There is very little such space left in the U.S., a casualty of unbounded, industrial-scale human expansion. What remains for Den Hartog is an invented…