Final answer:
The quote examines a theme of transformation where the distinction between humans and animals is blurred, reflecting on deeper societal or human commentary.
Step-by-step explanation:
The quote “The creatures outside looked from pig to man, and from man to pig... but already it was impossible to say which was which” suggests a theme of transformation and the loss of distinct identity between humans and animals. This theme is evident in literature where characters or creatures undergo a change that blurs the lines between species, often reflecting a deeper commentary on society or human nature.
Such transformations can be found in various texts, from the literal metamorphosis of characters to the allegorical evolution of creatures taking on human traits.
These narratives compel us to reflect on our own humanity and the way we relate to the animal world.