Here's a symbol that comes at you like an anvil (see "Symbols: The Puzzle" for another): baby turtles. Let's let Nadia explain it:
When baby turtles come out of their shells, which are round—about the same size as a golf ball—they are squinched up into a round shape that fits inside the eggs. After they break through the shell, they spend three days down in the sand hole straightening themselves out. Sometimes they die before they make it out of the shell. Those are the dead-pipped. They are counted and discarded with the unhatched and the empties. A permitted person has to decide if the live-pipped are more alive than dead. If the decision is that they stand a good chance of surviving, they need care. They are lifted from the nest and taken home and given shelter until they straighten themselves out, and then they are released onto the sand. ("Nadia".78)
If it weren't for people coming in and physically moving the turtles around, many of them wouldn't survive. Know who else gets physically moved around? Nadia, Ethan, Noah, Julian, and Mrs. Olinski.
Okay, the last one is a bit of stretch, but you get the point. They're travelers, but not of their own volition. They get picked up and moved around—and then realize that they're where they always wanted to be in the first place.