Chronicle Books' blog: "From the design desk: Ends"

Another inside peek at the way the brains of the Chronicle Books designers work: this time, it's a fairly glorious exploration of bookbinding details – all about endpapers. 

Another integral element of every hardcover which deserves some special attention are the endpapers. Also commonly known as end sheets, or endleaves, around here we usually just refer to them as “ends.”
These are first and last pages found in a hardbound book. Half of each endpaper is glued onto the inside of one of the covers and the other half joins that cover to the textblock. (The inside pages of a book all together are referred to as the text block or book block.) The part of the endpaper which is pasted to a cover is called the pastedown endpaper, and the unattached half is called the loose endpaper or flyleaf.