In between family Bibles, I am playing. For a former coworker who loves beer, I decided to create a pop-up book as a wedding gift. I'm no paper engineer, so I used a well-engineered product. The book can be a guest book, photo album, beer-bottle display.... whatever! I strengthened the inside moving parts with PVA and cloth tape, sewed pages to an accordion spine, and added an outside spine of bonded leather. The bottle-cap closure holds its place with a strong little magnet taped to the inside front. Velcro keeps up the bottom flaps until they're needed.