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From BoLT1; "The Hiding of Valinor" :

In the East however was the work of the Gods of other sort, for there was a great arch made, and, 'tis said, 'tis all of shining gold and barred with silver gates, yet few have beheld it even of the Gods for the wealth of glowing vapours that are often swathed about it. Now the Gates of Morn open also before Urwendi only, and the word she speaks is the same that she utters at the Door of Night, but it is reversed."