The X?! OODA Ten Years celebrates the Oporto Office for Design and Architecture studio's 10th anniversary. The code name - readable from and in every idiom - is represented in an intertwined form, where the three milestones of the code, the X, !, and ? merge, and create a symbol with the exaltation of the traveled path and the questioning of what is to come. The transparent cover of the book explores the multidimensional idea and the physicality of matter.