Almighty’s existence is in the very cities we live in. Look at the perfect symmetry!” She had to admit, there was something compelling about the patterns. “It could be a false correlation. Both caused by the same thing.” “Yes. The Almighty,” he said, sitting. “Our very language is symmetrical. Look at the glyphs—each one can be folded in half perfectly. And the alphabet too. Fold any line of text down across itself, and you’ll find symmetry. Surely you know the story, that both glyphs and letters came from the Dawnsingers?”
Of course this is a reread. After Rhythm of War. I mean after all the the true Almighty of the Cosmere, Mr. Brandon Sanderson, may His name always be uttered with reverence and awe, practically slapped us in the face with the "Music" fact in the title of book 4.
But I have a cousin that I have discussed this theory with to some length. He keeps stumping me with the "Light" question that is obviously always involved with the surges on Roshar.
As I write this at 0325 in the morning it occurs to me that while the various forms of light are required for this magic system the light alone alone doesn't DO anything.
Stormlight, Voidlight, and the third light, Warlight I think it is called. Are all only the catalyst for surges. They are the actual Investiture born of the Shards represented in the Rosharian system.
Stormlight is the Investiture of Honor.
Voidlight is the Investiture of Odium.
What Shard is Warlight the Investiture of? Could it be the illusive Shard we hear of from Khriss? The Shard that remains Unnamed up until this point? The one she says "wishes to remain hidden" in the Cosmere?
Is there a Shard of Rhythm?
Perhaps a Shard Of War? If so then wouldn't there have to be a Shard of Peace then to maintain the symmetry that the Cosmere seems to always demand?
And what of Cultivation? How does Her Investiture present? Lift's surgebinding is certainly the product of Cultivation. And like i said, it's now 0352 in the morning. So excuse this rabbit hole. But I can't recall if Lift "draws" in Stormlight or only metaballizes it? I think she only creates her own Investiture from food. And we can be fairly crtain that she saw Cultivation when she visted the Nightwatcher. Just like Dalinar. So is she NOT an actual Edgedancer? Smh...
But in any eventuality. I stand behind my hypothisis that the various lights are the raw fuel for the Surges. The presentation of Rhythm releases the energy represented by the Investiture.
Is anybody else this confused at this point.

