A Box of Nothing is a novel by Peter Dickinson published in 1985.
A Box of Nothing is a novel in which a youngster acquires a box containing the original nothingness that existed before the beginning of the universe.
[1] Dave Langford reviewed A Box of Nothing for White Dwarf #66, and stated that "Somewhere in the entropic desert a new universe is gestating, and there's a race to ensure it's the right kind of universe.
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Amiable and batty.