Neil Gaiman said this quote
“ Yes, I was scared of the Daleks and the Zarbi and the rest, but I was taking other, stranger, more important lessons away from my Saturday tea time serial. For a start, I became infected by the idea that there are an infinite number of worlds only a foot step away. And another part of the meme was this- some things are bigger on the inside than they are on the outside. And perhaps some people are bigger on the inside than they are on the outside as well. And that was only the start of it. ”