Cai Cuo-Qiang’s Head On glass install Published December 2, 2013 at 1080 × 1620 in Cai Cuo-Qiang’s Head On glass install ← Previous Next → The glass sits vertically by being clamped all along the ramp at the top, and by the base. It is lined up by eye, and checked with a level before being securely clamped into place.