The Pig's Head
The Lord of the Flies
The description used to give an image for the Pig's Head shows the deep darkness it held and the power that the symbol of the Head had over the island.
Within this paragraph it portrays an idea of about how much power the darkness had over Simon. The LOTF is Simon's personal symbol of the evil within and its being brought out through this confrontation.
Blankly, the LOTF is telling Simon that their eternal greed and Man's darkness is the true Beast. He is figuratively explaining the reality of their situation.