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Don Hertzfeldt's most renowned work is "It's Such a Beautiful Day," an animated short film released in 2012. The film follows the surreal and introspective journey of Bill, a stick figure who grapples with the complexities of life, love, and mortality. Through its stunning visuals, poignant storytelling, and philosophical depth, "It's Such a Beautiful Day" has garnered critical acclaim and established Hertzfeldt as a visionary animator.