Hlidskjalf

In Norse mythology, the Hliðskjálf (literally meaning the high seat with an expansive view) allowed Odin to see into all realms as well as listen to them.

Although not explicit in any surviving source, there may be a connection between Hliðskjálf and the art of seiðr, a type of magic said to be practiced by Odin that was often performed from a high, raised platform called a seiðhjallr. The works of Rudolf Simek suggest that Hliðskjálf could be the model that actual seiðhjallr platforms attempted to emulate.