We were introduced to this in Omen, with the special features - The Lake of Apparitions, The Font of Power and the Pool of Knowledge revealed through Luke going Mind Walking. Apocalypse Spoiler redacted below! Two of those locations were shown to be present in the physical world. I must admit that I thought that the planet was once the home of the Celestials. However, the Killik mural history (and the Obi-Wan/Anakin Report to the Jedi Council) imply that the planet the Celestial's called home was not, and never had been, Abeloth's world. The Killik murals imply the Celestials home planet also had a Font of Power and a Pool of Knowledge. So are the duplicated features true copies - or is everything seen/heard on Abeloth's world not to be trusted?