“It enters the room at a 30-degree angle, its steps and risers mitered to dramatic points, its uprights perpendicular not to the floor but to its own sloping rails.”

“Without changing your elbow angle, keep your left elbow glued to your side and rotate your left shoulder, raising your forearm vertically as far as you can, aiming for a perpendicular position.”

“Houses seem to cling by blind faith to the perpendicular hillside.”