The Eye Between Worlds belonged to Manannan and he kept it in his study on a bookshelf. By use of magic it allowed its user to communicate to computers in the Other World. When Derek Karlavaegen took over the house after Manannan was turned into a cat, he began to record history on the Eye and sent the documents to the Other World to Peter Spear and others to read. Priscilla magically gave The Wanderer one of these computers to help on his journey as well.