Beyond the platform there was more enchantment. Some act of God—a typhoon perhaps, or the storm that had accompanied his own arrival—had banked sand inside the lagoon so that there was a long, deep pool in the beach with a high ledge of pink granite at the further end.
Nature on the island is first depicted as compellingly beautiful. Ralph encounters a tropical paradise as he comes to the lagoon with its warm purple, blue, and green water and strips naked to swim in it, like a child of nature or Adam in the Garden of Eden. This passage, which is longer than the short excerpt above, is worth looking at fully. It is filled with lyrical (emotionally infused) imagery—description using the five senses—that conveys the intense loveliness of this deserted spot. Ralph thinks in terms of his own culture, too, as he views the lagoon for the first time, tying it to ideas of enchantment and God.
The first rhythm that they became used to was the slow swing from dawn to quick dusk. They accepted the pleasures of morning, the bright sun, the whelming sea and sweet air.
In the passage above, the boys' disciplined ideas of how a day should proceed merge and bring order to the beauty of the island. The boys are still living in the Edenic world before the Fall, at one with the natural world. Again, as so often, the language is lyrical. Golding uses alliteration in "slow swing" and "dawn ... dusk" to create a sense of rhythm that reflects their lives. Positive adjectives, such as "bright" and "sweet" express in simple words the beauty of life lived in harmony with nature.
Somewhere over the darkened curve of the world the sun and moon were pulling; and the film of water on the earth planet was held, bulging slightly on one side while the solid core turned. The great wave of the tide moved further along the island and the water lifted. Softly, surrounded by a fringe of inquisitive bright creatures, itself a silver shape beneath the steadfast constellations, Simon's dead body moved out towards the open sea
The quote above shows us Simon's corpse on the water, becoming one with nature. Again, the language is lyrical, as Golding first conveys the movement of the entire earth as it turns and then focuses in on Simon's body swept to sea. The alliterative "s" sounds add to gentle, peaceful mood of the scene, as the spiritually attuned Simon returns to nature. The fish around Simon are personified as inquisitive, and positive images surround Simon, exemplified with words like "bright" and "silver."
But the island was scorched up like dead wood—Simon was dead—and Jack had... The tears began to flow and sobs shook him.
In the famous quote above, the island is depicted, after the "fall" of the boys into evil and barbarism, as "dead" after the fire consumes it. Ralph is overcome at this point with grief, not only at the burnt remains of the island and the death of his comrades, but by the loss of innocence all of this represents.
Golding uses the structure of the story of the Garden of Eden to guide his depictions of nature. Nature begins as Edenic: beautiful, harmonious, and life-giving when they boys live in it innocently, but scorched, burned, and dead as the fall into evil unleashes the human will to dominate and hurt.