It is well known to all students of science that particles of matter never actually touch one another, even in the hardest of substances.

The spaces between them are always far greater in proportion than their own size--enormously greater.

So there is ample room for all the other kinds of atoms of all those other worlds, not only to lie between the atoms of the denser matter, but to move quite freely among them and around them.

Consequently, this globe upon which we live is not one world, but seven interpenetrating worlds, all occupying the same space, except that the finer types of matter extend further from the centre than does the denser matter.
We have given names to these interpenetrating worlds for convenience in speaking of them.

No name is needed for the first, as man is not yet in direct connection with it; but when it is necessary to mention it, it may be called the divine world.