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Jack pointed suddenly.
“His specs – use them as burning glasses!”
Piggy was surrounded before he could back away. (2.159-161)
Piggy’s glasses become the boys’ one technological advancement. We wonder why Jack is the boy that thinks of using them.
“You'll get back to where you came from.” (7.15)
Simon is like a prophet here. He knows what he’s talking about, in the horrible-foreshadowing-of-his-own-death kind of way.
[…] in front of Simon, the Lord of the Flies hung on his stick and grinned. At last Simon gave up and looked back; saw the white teeth and dim eyes, the blood – and his gaze was held by that ancient, inescapable recognition. (8.230)
Simon is able to see things and have insights that the other boys are not capable of. In this case, he sees fear, violence, death – in other words, himself, and all other human beings – captured in the grinning face of the pig.