When Aang, Katara, Sokka, Toph, Appa, and Professor Zei found a large tower in the middle of the Si Wong Desert, they were unaware that they were looking at the top of Wan Shi Tong's Library until, suddenly, a Knowledge Seeker appeared over a dune, carrying a scroll in its mouth. It approached the building and scaled the walls without effort, entering through a small window at the top of the tower, which made the group realize they were not looking at an ordinary tower; they had found what they had been searching for, the spirit library.