- Dimensions: 32.5 cm wide x 35 cm high
- Material: cardboard
- Numbered series
- 2 pages
- Languages: Spanish/English and Basque/French
- A fold-out book, also called a pop-up book or 3D book, is one that makes the most of and exploits the three-dimensional possibilities of paper, playing with all its folding forms, to form a replica of the Bizkaia Bridge.