2 Of Valinor and the Two Trees

[Findegil]

What do we know about Nienna and Vairë? See here descriptions in the Valaquenta:

... Vairë the Weaver is his[Mandos] spouse, who weaves all things that have ever been in Time into her storied webs, and the halls of Mandos that ever widen as the ages pass are clothed with them.
...
Mightier than Estë is Nienna, sister of Vala-04.2 {the Fëanturi}<Vq2 Námo>; she dwells alone. She is acquainted with grief, and mourns for every wound that Arda has suffered in the marring of Melkor. So great was her sorrow, as the Music unfolded, that her song turned to lamentation long before its end, and the sound of mourning was woven into the themes of the World before it began. But she does not weep for herself; and those who hearken to her learn pity, and endurance in hope. Her halls are west of West, upon the borders of the world; and she comes seldom to the city of Valimar where all is glad. She goes rather to the halls of Mandos, which are near to her own; and all those who wait in Mandos cry to her, for she brings strength to the spirit and turns sorrow to wisdom. The windows of her house look outward from the walls of the world.

For Este we also have to take into account the Story of Miriel:

Therefore when Nienna came to him and renewed her prayer for Míriel, he consented, accepting the abnegation of Finwë as her ransom. Then the fëa of Míriel was released and came before Manwë and received his blessing; and she went then to Lóriën and re-entered her body, and awoke again, as one that cometh out of a deep sleep; and she arose and her body was refreshed. But after she had stood in the twilight of Lóriën a long while in thought, remembering her former life, and all the tidings that she had learned, her heart was still sad, and she had no desire to return to her own people. Therefore she went to the doors of the House of Vairë and prayed to be admitted; and this prayer was granted, although in that House none of the Living dwelt nor have others ever entered it in the body. But Míriel was accepted by Vairë and became her chief handmaid; and all tidings of the Noldor down the years from their beginning were brought to her, and she wove them in webs historial, so fair and skilled that they seemed to live, imperishable, shining with a light of many hues fairer than are known in Middle-earth. This labour Finwë is at times permitted to look upon. And still she is at work, though her name has been changed. For now she is named Fíriel, which to the Eldar signifies 'She that died', and also 'She that sighed'. As fair as the webs of Fíriel is praise that is given seldom even to works of the Eldar.

This story as well makes clear that Vairë and Nienna were often among the dead Elves in the Halls of Waiting, because all the talk between Míriel and Finwë on the on side and Vairë on the other took place there and because Nienna is the one that approaches Mandos with the desire ofre-housing from Míriel.

So what do I make out of it: The Hall Fui is very unlikely a place ‘loved’ by Vairë. If the work of Míriel is taken as an example the House of Vairë is by no means dark form the inside. It must then be rather colourful. For Nienna on the other hand in here mourning and in teaching ‘pity, and endurance in hope’ the Hall Fui to which the dead Men are summoned and where they wait for a time before going to the fate Men, seems a very fitting place. Especially since the fate of Men had to be accepted in a way with ‘Estel’ only not with ‘Amdir’, that is with belief in the good will of Eru rather than with hope build on experience.
That said, I propose the following changes:[quote] So fair were these abodes VT-EX-14 {and so great the brilliance of the trees of Valinor} that {Vefantur}[Namo] and VT-EX-14.2{Fui}[Nienna] his {wife}[sister] of tears might not endure to stay there long, but fared away far to the north-ward of those regions, where beneath the roots of the most cold and northerly of the Mountains of Valinor, that rise here again almost to their height nigh Arvalin, they begged Aulë to delve them a hall. Wherefore, that all the {Gods}[Valar] might be housed to their liking, he did so, and they and all their shadowy folk aided him. Very vast were those caverns that they made stretching even down under the Shadowy Seas, and they are full of gloom and filled with echoes, and all that deep abode is known to {Gods}[Valar] and Elves as Mandos. There in a sable hall sat {Vefantur}[Namo], and he called that hall {with his own name }Vê. It was lit only with a single vessel placed in the centre, wherein there lay some gleaming drops of the pale dew of {Silpion}[silver light]: it was draped with dark vapours and its floors and columns were of jet. Thither in after days fared the Elves of all the clans who were by illhap slain with weapons or did die of grief for those that were slain - and only so might the Eldar die, and then it was only for a while.
There Mandos spake their doom, and there they waited in the darkness, dreaming of their past deeds, until such time as he appointed when they might VT-EX-14.3{again }be {born into their children}[re-housed], and go forth to laugh and sing again. To Vê {Fui}[Nienna]