CGI is done after the film is done. It's through the computer. Most of the film is not computer-generated special effects. Most of it is that creature that is in the room with you.
“I was trying to figure out what to do next, I'd been accumulating ideas for productivity tools - software people could use every day, particularly to help organize their lives.”
“The BBC provides the commentary on our lives, the soundtrack of the nation. It is one of the most powerful unifying forces in the United Kingdom today.”