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The Hall of Wisdom is a cavern on K'tau. It possesses a holographic projector, which shows an image of a human claiming to be Freyr. Manipulation of a control panel nearby will deactivate the device and alert the Asgard, at which point the real Freyr will appear. SG-1 used it to contact the Asgard on several occasions. (SG1: "Red Sky", "Fail Safe") However, SG-2's later attempt to do so failed. (SG1: "Menace")