“People ask, How did you get in there? What they really want to know is if they are likely to end up in there as well. I can’t answer the real question. All I can tell them is, It’s easy.

And it is easy to slip into a parallel universe. There are so many of them: worlds of the insane, the criminal, the crippled, the dying, perhaps of the dead as well. These worlds exist alongside this world and resemble it, but are not in it.…

…In the parallel universe the laws of physics are suspended. What goes up does not necessarily come down, a body at rest does not tend to stay at rest; and not every action can be counted on to provoke an equal and opposite reaction. Time, too, is different. It may run in circles, flow backward, skip about from now to then. The very arrangement of molecules is fluid: Tables can be clocks; faces, flowers.

These are facts you find out later, though.

Another odd feature of the parallel universe is that although it is invisible from this side, once you are in it you can easily see the world you came from. Sometimes the world you came from looks huge and menacing, quivering like a vast pile of jelly; at other times it is miniaturized and alluring, a-spin and shining in its orbit. Either way, it can’t be discounted.

Every window on Alcatraz has a view of San Francisco.”