"The ownership of land is an odd thing when you come to think of it. How deep, after all, can it go? If a person owns a piece of land, does he own it all the way down, in ever narrowing dimensions, till it meets all other pieces at the center of the earth? Or does ownership consist of only a thin crust under which the friendly worms have never heard of trespassing?"
Tuck Everlasting, p. 7
By Natalie Babbit