Bubble Buddy has a unique art style that isn't seen anywhere else in the show, and out of every episode in season 2, this episode is the closest looking thing to season 1:
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Although it's electronically colored, it maintains that homemade healthy organic look. Neptune knows what kind of primitive machinery was used to color these episodes. I like the subdued look of the earlier seasons. But modern episodes, especially post 2nd movie have a a genetically modified look, with cancerous bright colors. I for one, hate the new post sequel art style, episodes are so wacky and off-model nowadays to the point that the show no longer has a definitive art style:
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Off model animation does not work in the age of crisp animation. This is when Spongebob is not making wacky faces, and it still looks weird and disproportionate. I would much prefer if they stuck with the art style that they had in the first half of season 9.