What do the pigs gradually become indistinguishable from?

The pigs gradually become indistinguishable from the human oppressors to highlight the central theme of the novel regarding the cyclical nature of power and corruption. As the story progresses, the pigs, who initially lead the rebellion against humans and promise equality, begin to adopt the same oppressive behaviors as the farmers they overthrew. This transformation emphasizes how absolute power can corrupt and lead those in power to perpetuate the very injustices they once fought against. By the end, the pigs' actions, behaviors, and even their appearance resemble that of the humans, symbolizing the loss of the revolution's ideals and the betrayal of the other animals on the farm. This chilling conclusion underscores the idea that without vigilance and accountability, the oppressors can easily become the oppressed, rendering the struggle for a fair society futile.