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"Life […] is scientific, that's what it is. In a year or two when the world is over they'll be traveling to Mars and back. I know there isn't no beast—not with claws and all that I mean—but I know there isn't no fear either."
"Unless we get frightened of people." (5.99, 104)
There's nothing to be afraid of, says Piggy—unless we start to fear other people. Trust rational, scientific Piggy to understand.
“Maybe […] there is a beast
What I mean is… maybe it's only us.” (5.183-195)
Simon and Piggy come to equal-but-opposite conclusions. Piggy has a kind of rational, external, empirical attitude—we're afraid of each other. Simon has a more spiritual insight: it's not each other we need to be afraid of, but ourselves. Subtle? Sure. But it's an important difference.
"It was furry. There was something moving behind its head—wings. The beast moved too—"
"That was awful. It kind of sat up—"
"There were eyes—"
"We ran as fast as we could—" (6.67-75)
Samneric do see something; they see the dead parachuter. But their fear makes them see something totally different from what actually exists—like turning a pile of clothes in your closet into a monster.