The symbolism of Earl (Earth) and Sky (Heaven)

The two youths Howard (Shepherd) meets in the story, Earl and Sky, represent two extremes. Earl's name is fitting because he's full of volcanic rage that spits out from deep within the Earth (Earl/Earth, get it?). Sky, on the other hand, is completely spiritual in nature (hence, sky/heaven). She's full of warmth, love, compassion and forgiveness. In fact, she's the crucial Christ figure without which there would be little reconciliation for anyone in the story.

Take note of the scene where Sky meets Howard in his hotel room. Sky just looks at him with the understanding eyes of divine love. This naturally makes Spence uncomfortable; he's never experienced this before. He doesn't know what to do, so he asks -- demands -- her to leave.