An agency accepts assignments for a model, sends bills to clients, and collects money owed the model. The agency receives a percentage of the model's earnings as a commission. Successful models are registered with a licensed model agency. Some models have taken courses from modeling schools. Most insurance sales agents, stockbrokers, and financial services sales representatives have a college education. Employers also prefer to hire wholesale and manufacturing sales representatives who have a college degree. Film encompasses individual motion pictures, the field of film as an art form, and the motion picture industry. Films (also referred to as movies or motion pictures) are produced by recording photographic images with cameras, or by creating images using animation techniques or visual effects. Films are cultural artifacts created by specific cultures, which reflect those cultures, and, in turn, affect them. Film is considered to be an important art form, a source of popular entertainment and a powerful method for educating — or indoctrinating — citizens. The visual elements of cinema give motion pictures a universal power of communication. Some films have become popular worldwide attractions by using dubbing or subtitles that translate the dialogue. Photography is the process, activity and art of creating still or moving pictures by recording radiation on a radiation-sensitive medium, such as a photographic film, or an electronic sensor. Light patterns reflected or emitted from objects activate a sensitive chemical or electronic sensor during a timed exposure, usually through a photographic lens in a device known as a camera that also stores the resulting information chemically or electronically. Photography has many uses for business, science, art, and pleasure. Video technology was first developed for cathode ray tube television systems, but several new technologies for video display devices have since been invented. Standards for television sets and computer monitors have tended to evolve independently, but advances in computer performance and digital television broadcasting and recording are resulting in a convergence of standards and use of content. Computers can now display television and film-style video clips and streaming media, encouraged by increased processor speed, storage capacity, and broadband access to the Internet. General purpose computing hardware can now be used to capture, store, edit, and transmit television and movie content, as opposed to older dedicated analog technologies.