After she went back down, Wren started going to the fifth ring.
She told herself it was to see the seal Sela had patched, to check the work, which was a Keeper thing to do and gave her a reason, and it was half true, and the other half she didn't look at for a while. She went in her off hours, when she still had off hours, and she sat in the fifth-ring pump room while a seventeen-year-old girl named Sela — brown, square, quick-handed, not clever the way Lys was clever but clever the way water is clever, which is the only kind that ever kept anybody alive — showed her the patch and then, because Wren asked, showed her the rest of it.