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What is called "sponge stone" or "Pompeian pumice" appears to have been reduced by burning from another kind of stone to the condition of the kind which we see. The kind of sponge-stone taken from this region is not produced everywhere else, but only about Aetna and among the hills of Mysia which the Greeks call the "Burnt District," and in other places of the same peculiar nature. ...it seems to be certain that moisture has been extracted from the tufa and earth, by the force of fire, just as it is from limestone in kilns.
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Chapter VI, Sec. 2-3

 

Vitruvius

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The reason why lime makes a solid structure on being combined with water and sand seems to be this: that rocks, like all other bodies, are composed of the four elements. Those which contain a larger proportion of air, are soft; of water, are tough from the moisture; of earth, hard; and of fire, more brittle. Therefore, if limestone, without being burned, is merely pounded up small and then mixed with sand and so put into the work, the mass does not solidify nor can it hold together. But if the stone is first thrown into the kiln, it loses its former property of solidity by exposure to the great heat of the fire, and so with its strength burnt out and exhausted it is left with its pores open and empty. Hence, the moisture and air in the body of the stone being burned out and set free, and only a residuum of heat being left lying in it, if the stone is then immersed in water, the moisture, before the water can feel the influence of the fire, makes its way into the open pores; then the stone begins to get hot, and finally, after it cools off, the heat is rejected from the body of the lime.

 

Vitruvius

 

"Do you remember back at the hotel when you promised that if we lived, you'd get dressed up in a nurse's outfit and give me a sponge bath?"
"Actually, I think you misheard," Clary said. "It was Simon who promised you the sponge bath."
Jace looked involuntarily over at Simon, who smiled at him widely. "As soon as I'm back on my feet, handsome."
"I knew we should have left you a rat."

 

Cassandra Clare

 

"Could Yarl the Omnipotent create a stone so heavy he couldn't lift it?" asked Green Green.
"No," replied Courtcour.
"Why not?"
"He wouldn't."
"That's no answer."
"Yes, it is. Think about it. Would you?"

 

Roger Zelazny

 

"Bird and beast and stone and star — we are all one, all one —" murmured the Hamadryad, softly folding his hood about him as he himself swayed between the children.
"Child and serpent, star and stone — all one."

 

P. L. Travers

 

"One thing more, son. Do you believe in God?"
Slowly Frost put the spoon back into the bowl.
He asked: "You really want an answer?"
"I want an answer," said the man. "I want an honest one."
"The answer," said Frost, "is that I don't know. Not, certainly, in the kind of God that you are thinking of. Not the old white-whiskered, woodcut gentleman. But a supreme being — yes, I would believe in a God of that sort. Because it seems to me there must be some sort of force or power or will throughout the universe. The universe is too orderly for it to be otherwise. When you measure all this orderliness, from the mechanism of the atom at one end of the scale, out to the precision of the operation of the universe at the other end, it seems unbelievable that there is not a supervisory force of some kind, a benevolent ruling force to maintain that sort of order."

 

Clifford D. Simak