AtD splitting the Koan again?

[Mark Kohut]

 Focusing again, maybe Koan as image? (metaphoricaly this time) and
 nodding to Paul M. and his riff on the incredible mind-stretching metaphors,
images, etc. (if I am praphrasing OK, Paul? ) of Pynchon, many of us might
agree that Iceland Spar in Against the Day is (one of) the most......interesting?
 
Part of the doubling motif, lots of it, in AtD, it is to me intriguing and puzzling because
the split Spar light doesn't split far. It isn't Doppleganger-like, a Jungian or Dostoevskyan
Shadow Double. Is it?  It is very like other curious doubles in AtD, Renfrew & Werfner and Nigel
and Norville, who are both more like Tweedledum and Tweedledee than like secret doubling sharers...
WTF?
 
In Paul's way of suggesting, Iceland Spar has, to me, come to mind when, for example, I
drove Chicago streets decades later that I used to drive regularly. Cityscape came back clear
yet it was all "off'. I have thought of the metaphor when thinking on something in my past, which
I now see ...aslant, so to speak. {Who wrote, "Tell the truth, but tell it slant"---the great Emily?}  
Or, I think of it now rereading AtD, which is different from my first reading yet.....same light. 
 
Is one of the types of Pynchonian ambiguity [rich resonance] re Iceland Spar about seeing just
a bit differently---perhaps like an artist would? Light, light, an artist's medium and a major
subject of ATD.... Light is 'the secret determinant of history' is up ahead. 
 
I stumbled upon Stephen King saying this: "the author's job is to create a bifurcation in the reader's mind. 
One half says this is all make-believe, words on a page; the other half is living that life. becoming more and
more real." Not suggesting any influence just a confluence, maybe, with a statement that certainly doubles
up on the Chums' make-believe and becoming real---ness...