Circa XX , the private collection of Pilar Citoler , is one of the most important private collections of international contemporary art in Spain. Its holdings are particularly noteworthy for their original works on paper, never before exhibited in their entirety, which are now partially presented in this catalogue . This book brings together more than 350 works, including pieces by artists such as Picasso , Julio González, Benjamín Palencia, Le Corbusier, Joan Miró, José Caballero, Man Ray, Grete Stern, Henri Michaux , Miquel Barceló, Jasper Johns, Antoni Tàpies , Antonio Saura , Francis Bacon, and Andy Warhol, among many others. It also includes several artists' books that reflect their creators' fascination with the book-object and their desire to engage in dialogue with poets and writers.