Unusual, different and original, intentionally dedicated to children or related to their world because of the images and the language they use; special and unconventional books, sometimes little known, sometimes famous, available in bookshops or kept in museums or private collections. All of them distinguished by the fact that they have been created by artists and are the expression of an extreme freedom of design and creativity, which has given rise to significant and stimulating works of editorial production, opening a path followed by the most attentive part of experts. These are the books that ÓPLA has been collecting and archiving since 1997.