True Horizon

A miniature acrylic spirit level vial was lodged under the lightning rod ground clamp, neon-green fluid completely intact. I wiped the soot from its clear cylinder against my sleeve. The oval bubble floated freely between two printed black index lines. Kneeling on the warm copper flashing, I set the tube across the seam leading to the drainage scupper. The bubble leaned three millimeters left—consistent with the runoff gradient I tracked earlier with the steel bearing. I shifted the vial ninety degrees along the brick coping. The bubble drifted straight into dead center and held. Solid zero-degree baseline. Penthouse roof is sitting true.