This transcendent role is perhaps one of the most important uses of horses in Eddic sources, since so many myths revolve around the interaction of various mythological worlds always separated from each other by fire, water, air or earth.
Bridges and horses are the main means of connecting these different kingdoms.
Bifröst, sometimes referred to as a rainbow, is said to burn where the red color shines, the Gylfaginning explains that all Æsir must traverse the asbrú (Bifröst) daily to reach their judgment seats, it is not clear exactly which worlds they are connected by the Bifröst, but Urðr's well is where the gods take their daily advice across the bridge.
Þórr is the only exception among the gods who walks, does not ride, on Bifröst to Miðgarðr.
Both Grímnismál and Gylfaginning count twelve houses for twelve gods, but only eleven horses: Sleipnir, Glaðr, Gyllir, Glær, Skeiðbrimir, Silfrtoppr, Sinir, Gils, Falhófnir, Gulltoppr and Léttfeti.
In the Íslendingasǫgur, echoes of the role of the horse as a transcendent animal are found, the horse was in fact often associated with the dead and the afterlife, given its ability to predict fate and foretell death.
In Old Norse sources the horse is associated with supernatural powers over the elements, fertility and health.
In the Nordic world the horse was much more than just a transport animal for the living and the dead, it was considered a sacred, spiritual animal and, like a shaman, provided a connection between mortal and mythological beings to the realms of the unconscious and the supernatural.