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https://www.tvline.com/2100331/the-simpsons-animation-style-explained-episode-800/

The Simpsons Recreates Classic Animation Style In Episode 800: 'Part Of Me Wishes We Could Make Every Episode Look Like That,' EP Says

 

In celebration of its 800th episode, "The Simpsons" is taking fans back to where it all began. Sunday's milestone event opens with a recreation of the show's very first episode, 1989's "Simpsons Roasting on an Open Fire" (pictured above), lovingly animated in its original style — complete with a 4:3 aspect ratio.