Acting requires putting on a different face for different roles.
Exceptionally talented actors can transform into completely distinct characters (or creatures). Think about Tom Hanks -- he's played everything from a World War II solider to a lonely island dweller, and a friendly, animated cowboy.
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Mashable artist Bob Al-Greene pieced together the faces of six actors based on four of their most famous roles.
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BONUS: 5 Random Facts About Tom Hanks