Flúor was invited to join the group of designers to submit ideas and concepts for "tangential projects" to present at the 2011 edition of Lisbon Design Biennial. EXD 2011 presented itself as a platform for reflection and dialogue on the "useful and useless" and Flúor was part of this exercise, creating a publication with 2 ways of reading it, a useful and readable and another unreadable therefore useless. This publication had a circulation of 500 copies and had free distribution in a room where a video was shown which featured excerpts of the publication.