Doon has been raising a worm for some time. But now, after all that nurturing, this little green creature has finally become a magnificent moth with light brown wings.

For days, the worm had been hanging motionless from a bit of cabbage stem, wrapped up in a blanket of threads. During that time, Doon had watched the little critter carefully, thinking perhaps that it was either dead or undergoing the kind of change he'd once read about in a library book, the change from a worm into a flying thing.

But when Doon sees the worm start to wriggle out of the bundle of threads, he knows that it's not just alive and well but ready to complete its transition. In a matter of minutes, what was once just a little green worm emerges as a moth, the flying creature that Doon once read about.

Doon takes the box containing the moth and holds it to the open window. He then watches for a few moments as the moth stands still on the wilted cabbage leaf before it flutters its wings and rises high into the dark air, quickly disappearing from view.

To some extent, the worm's transformation into a moth symbolizes Doon's movement from the darkness of Ember to the light of the world above ground.