Mapping the Floor Grid

A braided rug fringe offered a stable line down to the living room carpet. I lowered myself smoothly, testing ground density beneath my boots. Thick weave. Soft footing. A discarded clear plastic soda bottle cap sat overturned two paces away. I dragged it against the table leg, turning the hollow cavity into a low ground marker, then aligned it parallel to the shadow line. Sector zero perimeter established.