"crenelated" writing?

What would it mean for writing to be "crenelated"? From this review:

Lisa Zeidner of The New York Times Book Review elaborated:

As usual, Gibson's prose is ... corpuscular, crenelated.

I thought crenelated just meant having ridges / being like the top of a castle wall.

Solution 1:

I think Ms. Zeidner meant that his language is full of contrasts, changing at sharp angles. At least that is how I interpret this: apparently the metaphor is Ms. Zeidner's own invention. Note that she purposefully uses some favourite words of Gibson's, as you can read in this version of the review:

As usual, Gibson's prose is — to use some of his favorite adjectives — corpuscular, crenelated. His sentences slide from silk to steel, and take tonal joy rides from the ironic to the earnest.

— http://www.themodernword.com/pynchon/gibson_review.html