There's a scene in Ruin of Angels (most recent Craft Sequence book) where it describes a hallway as "lit with a color she had never seen before."
And at the time I'm thinking, okay, magic octarine color, whatever. She's inside a squid god. A bit out-of-tone for the setting but okay.
Then a couple paragraphs later, it's mentioned that her escort's teeth are glowing, and I realized Oh! It's blacklight! I know how that looks.
That was a cool moment and captures some of the essence of the series.
