Walter is slow to follow, wincing intermittently as one after another more kernels of memory go off.

People aren't supposed to remember their whole lives like this...

Now, perhaps, is not the best time for thought, let alone coherent thought, but he can't stop himself from trying.

"Why..."

Don't ask about the past, about the Echoes. Anything except what's on your mind.

"Why do you have so many stencils, exactly?"