Old people walk down “up” escalator in mysterious ritual

They may have been there since the dawn of time. On the eighth day, God created escalators; on the ninth day, he put two old people on that escalator and sent them in a fruitless eternal pursuit to the bottom of that escalator, steadily proceeding down toward a conclusion they will never come to see. How long had they been on this before the filming began? Long enough, apparently, for them to make it 10 feet or so down at their interminable pace. They say nothing, acknowledge no one, just continue their resolute, obstinate journey. They were born on the escalator; they will never leave the escalator.