Frank was already staring at his hands, as if wondering how as he going to manage to make an entire book appear. It was why he'd been basically using only sheets of paper: he'd found them easier to manifest and easier to focus on, so they lasted longer.

He blinks at the last part, his attention back to Solomon. For once, something about Camp Jupiter comes in handy. "Uh, we were told something about that at camp. But it's more Greek than Roman, and most demigods have too much of hard time focusing to manage something like that either way, so it was a mention in passing.

It's something like imagining your mind as a literal place, right?"