Here's how any blank piece of paper is actually a magic trick with a false bottom:

Gentlemen, observe this piece of paper.  An ordinary sheet of paper, no watermark, no false bottom.  And now I'd like to ask someone for an ordinary pencil.  Thank you, sir.  In the meantime you can talk, play little games, do what you like, it won't make any difference to me.  And he sits down and begins to write.  Anyone can write.  There is no shortage of words.  And off he goes with them.  Now he shows whether there's anything in him or not, now he gives it all he's got.  And when we read his story, we forget this dreary reality, we discover in our own room a secret door that we had never noticed before, behind which all sorts of strange and unheard-of things go on.  It's not such an ordinary bit of paper after all; there is a false bottom, and there is a watermark which no one can forge. —Ernst Kreuder, The Attic Pretenders