CONCERTINA FOLD / ACCORDION FOLD

Pages are connected so the front of one leaf is attached to the rear of the next, appearing in the form of a continuous group of the letter "V". Brochures and leaflets can be created in this manner. A book with boards and pages connected in this manner is sometimes called a Leporello, the term being a reference to the manservant in Mozart's Don Giovanni, who at one point pulls out a set of demands on pages folded in this manner (Wiki).

The first image shows an illustrated adaptatation of Le Petit Chaperon Rouge (Little Red Riding Hood). The second image shows a small book from Barnacle Bindery and clearly shows the concertina fold construction.