[Ivriniel]

Although that is the most obvious example, it is one in a repetitious cycle. The Noldor, most appreciably, replicate the lapse in what I term "UN"sight--unsight. Unsight is the capacity of a being to discern how to position a greed-dead-lock in their crafting of items (The Rings), which would have prevented the disaster of the Mirdain. The Elves had very poorly developed Unsight--what an Elvish Creation looks like to The Corruptor.

Each creation by a being seemingly 'good' casts a shadow. Sauron and Melkor most cleverly (and stupidly) understood this. For example, I suspect that Sauron figured out what the Shadow side of the Elvish Spiritual World would be like in the metaphysical sense (Spectres, Shades, Wights and so on). This would seem to be that metaphysical dimension where life *runs out* from that plane, and back into the Void--the other way around. C.f. The Flame Imperishable - Life - From The Void. As such, Melkor's and Sauron's creations - discerned by Unsight - run the system the other way around. Metaphysical energy in the inverse, but in an inverse relationship to the Void when compared to life - The Two Trees, the Silmarils, etc.

So -- myy post looks more closely at what it means that a Vala such as Manwe was not, immediately, able to discern a way to work with Melkor. Or another way--the Valar were blind to the shadow relationships of their works with creation. And so, this is a Vanity. For, creators have the responsibility of knowing how their works look in the Shadow World. Without that Knowing, they create gross vulnerabilities in everything they create.

Another way to try to get the point across is that the Valar needed Melkor's gross, overt Vanity (to defile Eru's creations as toys), in order to see the Shadow Side of the Valar's denied Vanity. Melkor and Manwe are twin mirror image opposites. Two faces of existence, and the one cannot exist in some relationship with[out] the other.

However, how the relationship is manifested, does come down to the manner, mode, style and nature of consciousness, and to a preparedness to look at Melkor's inverse universe, without sacrificing the Flame Imperishable...