The Mundane Shell is a vast Concave Earth， an immense
Harden'd Shadow of all things upon our Vegetated Earth，
Enlarg'd into Dimension and deform'd into indefinite Space，
In Twenty-seven Heavens and all their Hells， with Chaos
And Ancient Night and Purgatory. It is a cavernous Earth
Of labyrinthine intricacy， twenty- seven folds of Opaqueness，
And finishes where the lark mounts.