It is easy to recognize the Agbar Tower, but it is difficult to discover its interior. How is the light treated? How is the space distribution approached? It is a compartmentalized space or an open floor? Where are the innovative technical solutions? What kind of furniture do the designers have created or chosen? The external colours, do they have anything in common with the interior? Gerardo García-Ventosa, designer and architect responsible for projecting Agbar Tower's interiors, describes the solutions that have been adopted in Jean Nouvel's Tower and explains the conceptual process followed to achieve them.