This is a structure developed by Gabriela Irigoyen inspired by a book developed by Philip Smith between 1970-1980. The covers are joined making an L shape at the center of the spine. This is an ideal structure for books with a spine bigger than 1,5cm. The covers are made of book board covered by Lokta paper. The book has 9 signatures with 6 folios in each of Canson XL Recycled Sketch paper.