“It’s more than a little ironic that what makes the original Tron (released in 1982) so visually striking isn’t the rudimentary computer graphics that it features, which would go on to inspire the widespread use of CGI in cinema. No, it’s something far more low-tech: the ‘backlit animation’ that would give the film’s ‘in computer’ sequences an ethereal glow; it was so expensive and time-consuming that it would never be used in another film. Although it is, in its own way, visually stunning, Tron: Legacy’s lack of such a ‘human’ process in its development gives the film a feeling that’s far colder than the original.”

Link (Blu-Ray review)