In the fifth passage, Golding uses symbolizes different egos and identities within the face mask.  The face mask that Jack paints on his face changes him into a complete different person. He loses his morals and senses and descends into a more primitive person; he becomes blood thirsty and is liberated of shame and self-consciousness : "Jack planned his new face. He made one cheek and one eye-socket white... liberated from shame and self-consciousness." This new Jack is a 'stranger' and is a whole different character from the one that we've been told.; this face mask gives Jack a whole new ego and a whole new purpose.  This mask is what Golding uses  to show how easily humans can turn into greedy, selfish, and destructive beings.  Making a theme that shows us how easily one can lose control over oneself during times of adversity such as this that Golding presents to the littluns.