" Nevertheless, to commit burglary you must cross some imaginary border, or invisible plane, and enter another clearly defined architectural space—a volume of air, an enclosure—with the intention of committing a crime there. Without walls and thresholds—without doorways, floors, and window frames, or even roofs, awnings, and screened-in porches—burglary would not be legally possible. It is a spatial crime, one whose parameters are baked into the very elements of the built environment. "

― , A Burglar's Guide to the City