This one came about in a really large book store with a pair of escalators leading to the second floor–one up and another leading back down. I always have to really pay attention as to which escalator is leading where, and a lot of times find myself traveling up the escalators going down, and vice versa. On this particular day I had approached one set when a man behind me rushed forward and started going up the wrong side. Of course, he corrected himself and walked over to the other set which led to the second floor. I thought it was funny, of course, but shortly after started to think about what would have happened if he hadn’t noticed he was climbing was the wrong set. I pictured him perpetually stuck on them and wondered how long it would take for someone to point out the other side to him. As a writer, this small plot point bloomed into a whole beast, playing with some big questions that I otherwise wouldn’t have thought of. After he got on the right set of the escalators, I immediately turned around, went to a table in a nearby coffee shop, and wrote the story.