The document discusses 3D films, how they work using stereoscopic vision, and some of the technical challenges. It notes that 3D films became very successful in the 2000s, particularly Avatar. However, many subsequent 3D films did not provide the same effect and seemed to be mainly a way for the film industry to make more money. Many viewers now prefer 2D films over 3D films due to issues like higher prices, blurriness, and headaches. The conclusion is that while 3D started out for artistic reasons, it has now lost its purpose and is primarily a money-making gimmick for films that do not include significant special effects.