Working behind the scenes of on-camera talent, film crews are a vital part of the moviemaking process, taking care of such things as production, art, hair and makeup, cameras, sounds, visual effects, and lighting. Many of the positions within the crew have special names. For example, lighting and rigging technicians are known as grips. The key grip heads the department and works with the director of photography to arrange lighting and blocking. The best boy, also on the lighting team, does what? Discuss