Spirit traveller is the technical name for it. I did it in my dreams, after I was asleep. I would get out of bed and walk through the wall to The Place Between — The World Edge — and go on from there. There are hundreds and hundreds of valleys with streams, and you sort of just walk down the right one until you get to the World you want.

Most don't do it like I do, of course, but I am the best spirit traveller in all the Related Worlds. Everyone else needs a medium of some sort to keep them anchored. A friend of mine has to be put in a trance while a young lady plays a harp, and he couldn't even see the valleys until I helped him.