Finally, the narrator understands—from his own perspective as a seven-year-old boy—why Lettie referred to the pond as an ocean: it
is an ocean. Even if the narrator wasn’t able to see this when he was at the ocean’s edge before, he now is able to see what Lettie saw when she stood by the pond. Getting this opportunity to see what the ocean really is helps the narrator empathize with Lettie more and cements their relationship even further. Meanwhile, Mrs. Hempstock’s mysterious disappearance reinforces the narrator’s understanding that she’s extremely powerful, even if he still doesn’t fully comprehend this supernatural universe.