توضیحات:

Interior design is the art and science of enhancing the interior of a building to achieve a healthier and more aesthetically pleasing environment for the people using the space. An interior designer is someone who plans, researches, coordinates, and manages such enhancement projects. Interior design is a multifaceted profession that includes conceptual development, space planning, site inspections, programming, research, communicating with the stakeholders of a project, construction management, and execution of the design.

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Commercial interior design and management:
In the mid-to-late 19th century, interior design services expanded greatly, as the middle class in industrial countries grew in size and prosperity and began to desire the domestic trappings of wealth to cement their new status. Large furniture firms began to branch out into general interior design and management, offering full house furnishings in a variety of styles. This business model flourished from the mid-century to 1914, when this role was increasingly usurped by independent, often amateur, designers. This paved the way for the emergence of the professional interior design in the mid-20th century.

In the 1950s and 1960s, upholsterers began to expand their business remits. They framed their business more broadly and in artistic terms and began to advertise their furnishings to the public. To meet the growing demand for contract interior work on projects such as offices, hotels, and public buildings, these businesses became much larger and more complex, employing builders, joiners, plasterers, textile designers, artists, and furniture designers, as well as engineers and technicians to fulfil the job. Firms began to publish and circulate catalogs with prints for different lavish styles to attract the attention of expanding middle classes.

Styles:
Terracotta Art Deco sunburst design above front doors of the Eastern Columbia Building in Los Angeles; built 1930.
The Art Deco style began in Europe in the early years of the 20th century, with the waning of Art Nouveau. The term "Art Deco" was taken from the Exposition Internationale des Arts Decoratifs et Industriels Modernes, a world's fair held in Paris in 1925. Art Deco rejected many traditional classical influences in favour of more streamlined geometric forms and metallic color. The Art Deco style influenced all areas of design, especially interior design, because it was the first style of interior decoration to spotlight new technologies and materials.

Art Deco style is mainly based on geometric shapes, streamlining, and clean lines. The style offered a sharp, cool look of mechanized living utterly at odds with anything that came before.

Modern Art
Modern design grew out of the decorative arts, mostly from the Art Deco, in the early 20th century. One of the first to introduce this style was Frank Lloyd Wright, who hadn't become hugely popularized until completing the house called Fallingwater in the 1930s.

Arab Materials
“Majlis painting”, also called nagash painting, is the decoration of the majlis, or front parlor of traditional Arabic homes, in the Asir province of Saudi Arabia and adjoining parts of Yemen.

Color in interior design:
Color is a powerful design tool in decoration, as well as in interior design, which is the art of composing and coordinating colors together to create a stylish scheme on the interior architecture of the space.