which appears to be the carcass of a beached leviathan. Noticing an engraving of a tree on a pillar, the boy describes his memory of a similar tree which grew to hold a giant egg containing a sleeping bird. When the girl inquires as to what the bird dreams of, the boy flatly asks if the girl still won't tell him what's inside her egg. The pair ascend a staircase arrayed with bottles of water, like those the girl collects, on each step. Adding her newest tribute to the line of bottles, the girl and boy reflect on their amnesia, wondering about their identity and purpose. The boy begins to recount the biblical tale of Noah's Ark. The tale deviates when the boy claims that the dove never returned to the ark, and thus its passengers forgot why they were sailing, forgot about the civilization drowned below, forgot about the animals who, as a result, turned to stone. The boy asks the girl if they themselves or if the strange world they live in really exists, or if it is merely a memory like his image of the sleeping bird. The girl suddenly insists that the bird does exist, and leads the boy down corridors of ancient fossils to arrive at an aerie. There they find the skeleton of a giant, angelic bird. The girl explains her intent to hatch the egg. Later, the pair warm themselves within the girl's settlement. As the girl drifts off to sleep, she speaks to the creature inside her egg of their future together. Outside, the heavy rain consumes the city and floods the streets. While the girl is turned away from the egg in her sleep, the boy takes it and smashes it, leaving afterwards. The next day, the girl discovers the broken shell of her egg and shrieks out, utterly heartbroken. She starts to run away from her settlement into the woods, past a giant tree holding a huge egg, in pursuit of the boy. In her haste, she falls into a ravine. Beneath the chasm's water, the girl transforms into an adult woman before releasing a final breath, which rises to the surface as a multitude of bobbing eggs. As the rain suddenly abates, trees holding eggs like those described by the boy are shown to be scattered throughout the landscape. The boy stands on a vast shore littered with white