Aesthetics is the branch of philosophy that deals with the nature and expression of beauty. Interior design involves planning, designing, creating, erecting, and constructing buildings that are functionally efficient, economically viable, and aesthetically pleasing. Key elements of aesthetics include mass and space, proportion, symmetry, balance, contrast, pattern, decoration, and massing. Aesthetic qualities like unity, proportion, scale, balance, symmetry, and rhythm collectively impact the design. Maximizing space and using design principles can help create homes that are beautiful, warm, and welcoming. Interior designers manipulate aesthetic and physical spaces to bring environments into harmony with their purpose.