When you are an interior designer, you are involved in all aspects of design from lighting and furniture to doors, windows, and walls. An interior designer's goal is to arrange these elements in an aesthetically pleasing, safe, and functional manner for the client. There are many potential customers for interior design companies. Among them are private homes owners, airports, theaters, malls, restaurants, hotels, hospitals, and corporations. Being a good designer requires you to be a psychologist, an artist, an architect, and a designer all rolled into one. Having knowledge of building code regulations, floor plans, building materials, modern designs, and current renovation trends is also a must to be a successful interior designer.