To put it plainly: I don't think I could bear watching a story without people and just a bunch of amorphous cgi-beings for thirteen hours. At least, it's challenging. We need to make the Valar into something close to people somehow, that's what makes them interesting in Tolkien's work. I think of them like entities similar to angels. Let's say Eru is represented visually partly by The Flame Imperishable. From that he lets light spring out, representing his creating the Ainur. When they enter Arda, they can be portrayed as anthropomorphic beings of light. In this, they need to be people in some way. Of course, they need to be able to change in ways that their seperate inclination indicates (Manwë turns into a small sized storm). The good thing about them being creatures of light is that Arda will be dark most of season one. The question is: What about Melkor? How does a creature of light produce shadows, in the dark? And how do we show that? (Of course, that's why the rest of the Valar don't know what he is doing)
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