I once measured a 80s-communally-built event space with a laser meter (it was useful to have digital floor maps for event planning). No measurement was a perfectly round number. No angle was perfectly right. Nothing really lined up. Except… there was this one set of stairs leading up to the stage. It was perfect. Every step was exactly the same in all dimensions, to the millimeter. It was perfectly level. I always wondered who this stair craftsman was, who prided themselves on doing such professional work among the presumed chaos. :-)