Pita followed, her mind bubbling with laughter as she explored her newfound perceptions. She could walk through walls, or across a busy street while cars zoomed through her ghostly form. She was jostled once, when a passenger in one of the cars made contact with her, and found that trees felt equally solid. But she could, if she chose, climb a flight of stairs, her feet never once touching them. Or she could wade chest-deep through a floor, as if it were made of water. The only things that presented a barrier to her were those that were alive—people, plants, and the earth itself.