how is this description important symbolically to the story?

The boys become accustomed to the pattern of their days on the island although it is impossible to adjust to the new rhythms of tropical life, which include the strange point at midday when the sea rises and appears to contain flickering images. Piggy discounts the midday illusions as mere mirages. While mornings are cool and comfortable, the afternoon sun is oppressively hot and bright, which incites fatigue among many of the boys. The northern European tradition of work, play, and food right through the day is not forgotten, making the transition difficult.

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Golding begins the chapter by describing a sense of order among the boys on the island, and he concludes it by describing the order's disintegration. Even the smallest boys appear to have accepted their fate on the island, and they have developed strategies, such as the building of sand castles, to minimize and contain their anguish. The key to the initial tranquility on the island is the maintenance of customs from the society in which the boys were raised. Yet, as the chapter's opening passages imply, these customs are threatened by the natural forces at work on the island. The regular schedule of work, play time, and meal time is impossible in the volatile tropical atmosphere. That the boys do not know whether the movement of the mid-afternoon sea is real or a "mirage" indicates how ill-adjusted to the island they still are.