a BOOK is a sequential collection of pages, loose leaf or bound. 

It is circulating as a PUBLICATION.

a BOOK OBJECT looks like a BOOK but it is not. 

a BOOK OBJECT has a sequential collection of pages, loose leaf or bound, but it is not circulating.

it is a unique piece or limited to a few copies.

CAKE a cake can look like a BOOK or like a BOOK OBJECT, but it is not.

it is not circulating and is a unique piece or limited to a few copies

it is not readable either. it doesn´t have functioning pages.

another term for the same thing would be SCULPTURE with the look of a  book

however, a BOOK OBJECT and even a BOOK can be a sculpture, too.

an E-BOOK is a digital file that mimicks a BOOK, though it is not. Like an ugly duckling, whose real potential is yet to be discovered.

it is a PUBLICATION and is circulating.