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The evolution of animation styles marked significant shifts, such as the transition from the simple line drawings of the 1920s to the more complex "rubber hose" characters. Describing whimsical characters with flexible limbs, this style laid the foundation for new explorations in anthropomorphism. Disney's venture into animating a more anatomically accurate human in "The Goddess of Spring" introduced new challenges related to the uncanny valley—the discomfort viewers feel toward figures resembling humans but falling just short of realism.