It's a climb they make every day, once when leaving, once when coming back. The staircase silently representing the fall that must come after every rise. And as its tramplers walk its grey, hard steps, they are treading on the artificial stones of their sanity.
But there are those who have silently disappeared from the staircase, leading their same straight line life until it vanished with an absolute, clean-cut interruption. It was simply a slipping of the foot, a random loss in balance, but by tripping on these stairs, they say, you trip, and lose your sanity.