2. Citizen Kane
Citizen Kane being colourized would be a travesty to cinema of the highest order. Orson Welles pioneered so many different camera techniques and ways to fully envelop an audience in a movie that you just can't do with colour. The deep focus cinematography is still revolutionary to this day because it helps give Kane, as a character, a larger than life feel since the camera captures his environment in perfect detail. People say that 3D adds depth but Citizen Kane still has more depth than any other movie ever made and that's partially due to the fact that it's in black and white. The film is essentially a mystery surrounding the life of Charles Foster Kane and the lack of colour accentuates the mystery much in the same way it does for the best entries in the genre of Film Noir. Just think of the way that Kane's seclusion is heightened at the end of the film by the depth of field that black and white provides. This gives the audience the ability really feel his folly and pain.