An Interior Designer is a person who is a professional in the field of Interior Design or one who designs interiors as part of their job. Interior designers prepare drawings and specifications for non-load-bearing interior construction,  this includes choice and decoration of walls, floors, roofs, choice and placement of furniture and other indoor objects, window treatments and other indoor objects, lighting and control of visual and sound effects.The work of An Interior Designer relies on many disciplines like environmental psychology, architecture, product design and traditional decoration. They plan the spaces of almost every type of building including: hotels, corporate spaces, schools, hospitals, private residences, shopping malls, restaurants, theatres, and airport terminals. Designers for smaller firms usually work on a contract or per-job basis. One can also become a Self-employed Designer. Interior Designing is one of the few professions where one can operate from home with a minimal investment.