'The Last Jedi' director Rian Johnson explains that inspiring final shot

Spoiler alert: This story contains major spoilers for Star Wars: The Last Jedi.Star Wars: The Last Jedi is all about moving on from the past – but its very last shot references a certain farm boy who's been around since the very beginning. 
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No, Luke Skywalker doesn't appear in that last scene, which shows a little boy casually using the Force to do his chores. He's dead by that point in the story, h