The Monsters of Millwood County

You blink and look closer at the lone figure in the drawing. He's wearing your clothes. He has your hair. He's wearing your backpack. Confused, you look around. How is that possible? You rack your brain for a moment, then decide to test something out.
You set down your bag and sit down, closing the book as you do so. You open the book back up and find the picture has changed, the drawing now mirrors your pose and the location of your backpack exactly. You quickly close the book, unsure of how this could possibly be happening.