What Makes an Unfilmable Novel?

And why unfilmable novels are often the best novels around

Recently my friend and general literary mensch Jason Diamond asked me a few questions about “unfilmable novels” for his excellent piece on the new White Noise adaptation at GQ. I haven’t seen White Noise yet, but his questions got me thinking about what actually makes a novel unfilmable. And that seems like a fun topic to write about as I wait for the h…