It had to be put together from half a dozen towns, a church from here, a school from there, supplemented with mock-ups, masking mattes, blue- and yellow-screen and back-projection.

ECONOMIST: Robert Boyle

Today's fashion for green screen and chroma key is not so far removed from the back projection and studio sets of Hollywood's Golden Age.

CNN: Review: 'Oz the Great and Powerful' is more than good enough