In "Lord of the Flies," Simon's conversation with the Lord of the Flies presents two possibilities. He may be hallucinating and the words he attributes to the beast, are actually his own subconscious thoughts. On the other hand, Simon may have actually witnessed a supernatural manifestation.
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If you're referring to Simon as he's talking to the pig head or the "Lord of the Flies" The pig represents pure evil, but Simon is also having a seizure as it is happening, so it may be his imagination.
It is a hallucination that has occurred as a result of the island's isolation having driven him mad. The pigs head is the Lord of the Flies as chaos and the inner savage within all of the inhabitants now rules over the island.
He talks to him
in chapter three
Yes he was. He had just found out that the beast lives within and was going to tell all the boys. But the boys were having a feast and partying. When he comes out of the jungle, the boys think he is the beast and stab him to death, everyone takes part. The next day everyone realizes it is Simon; yet no one will admit it was. :)