You ask your colleague if she's seen the Peterson file. She stares. You wait. You repeat it—slower this time, like you're narrating a nature documentary. Still staring. You're now convinced you've either become invisible or she's achieved some kind of enlightenment you haven't, and either way, you're not qualified to interrupt it. Finally she blinks and says "sorry, what?" and you realize she's been having the entire conversation with someone three desks over in her head.