Ilna Colemere holds an iPad over a children's nonfiction book about the solar system.
"So we're gonna access the camera and you hold it over and eventually" Colemere trails off while maneuvering the iPad over the page.
As we watch, suddenly the music fades up from the iPad, and a three-dimensional sun rises from the two-dimensional book with the planets quickly orbiting it.
This is augmented reality. Using a smartphone or iPad and an app from the book's publisher, you can see a wealth of unseen content, self-narrating books, or ones with 3D models.