Visual effects give freedom to filmmakers, writers and directors to tell any story they like. Humans have been telling stories since communication made it possible. A writer has full freedom to do anything including having their main character turn into a giant lizard. Myths from around the world describe actions and creatures that don’t exist in real life which can be turned into reality. A writer’s descriptions form images in the reader’s mind that can now be generated in photographic reality for the movie viewer.
Visual effects have been used in films almost from the beginning of movies. Some movies use matte paintings to add ceilings that were non-existent on the sets. Visual effects continued to evolve and provide sights not viable to actually film. Their style tended to be in keeping up with the film styles of the day (shooting outdoor scenes on sets, rear projection, etc). However, visual effects were not without their limits.
Visual effects require people who have developed very specific skills through years of training and experience. The visual effects team works closely not only with the director but also the cinematographer, production designer, stunt team and wardrobe department. Each of these departments is very helpful in providing visual effects in order to get back the best results. Visual effects artists and craftspeople have been developing and refining their tools for decades. Digital Intermediates (DI) are used for colour correcting films. These and many of the digital tools that film productions use daily are pioneered by visual effect artists. Therefore, we are at a point where just about anything that is imagined can be created on the screen and made to look good.