Over the past couple of decades, increasingly sophisticated computer-generated special effects have become a staple of multiplex blockbusters. One of the most extensive uses of the technology was in 2007's "Benjamin Button," a magic realism story of a man who ages in reverse. Special effects supervisor Eric Barba and his team spent several years creating an elaborate motion-capture system that used 28 cameras and scores of sensors to track the subtle movements of actor Brad Pitt's face in 3-D space, so that they would be replicated in several animated elderly versions of him.
The effect was so convincing that for the first 52 minutes of the film, the Benjamin Button character's head that viewers see is entirely computer-generated, with "zero real Brad," as writer, filmmaker and visual-effects expert Lee Stranahan noted in a Huffington Post article. This CG head was used along with various "body actors" to portray Button in his elderly years [source: Seymour].