Interior design is currently one of the most innovative disciplines of architecture. Contemporary architects are aware that there is a need for multi-functional and polyvalent spaces and at the same time highly defined spaces that are pleasant and calm and make their inhabitants feel comfortable. The search for bold and completely original forms that are adapted to the lifestyle of their inhabitants is often a factor that leads to experimentation and creativity with forms and materials. In the works of architects such as Takao Shiotsuka, Gracia Studio, Jay Kammen and Simone Micheli presented in this volume - including floor plans, technical specifications, materials used and a commentary on each project - we find stimulating answers, ingenious solutions, unexpected points of view and proposals that will certainly influence the concept of architectural interiors.