"Magic" Book

From THIS POST: (click)
"...a book that when opened continues to fold back on itself until it becomes flat again. Then, what was once the spine can be opened to reveal "more than two" double page spreads. I think I have been successful in figuring out how to make this book from that description; Something along the lines of a Jacob's ladder. Obviously this would open up amazing opportunities for illustrations!"

Based on the principle of a Jacob's ladder. Obviously the paper strips would cover exactly a third of the book in the 'real thing'. Sections of each illustration become covered with the paper strips or revealed, therefore sections can be changed, as if by magic!