 Who was talking to Jerome in the very beginning of the passage?
You will, you know, so why quibble about it? Yes, it'll be pretty obvious it must be a time machine. You are completely outside of time and space, as best you can guess how things are. Well, I asked it after I was told, then I came back and told it to you, and I still can't help answering when you speak. "Maybe it's no dimension—or it might be the fifth; if you're going to skip over the so-called fourth without traveling along it, you'd need a fifth. I figured out once that such a universe would need some seven or eight time and space dimensions.
 Jerome, from 30 years in the future
 Jerome, from 30 years in the past  Jerome, from 10 years in the past  Jerome, from 10 years in the future  Jerome, from 30 years in the future