What aspect of Gulliver's civilization do the Houyhnhnms find puzzling?

The Houyhnhnms, a race of intelligent horses in "Gulliver's Travels," are characterized by their rationality, simplicity, and moral integrity. They find the concept of clothing, specifically the idea of clothes as a form of distinction or adornment, puzzling because it reflects human vanity and social status. The Houyhnhnms live in a society where each individual’s value is based on their rationality and morality rather than superficial appearances.

In their world, the absence of clothes emphasizes their straightforwardness and natural state, where individuals are judged by their deeds and character rather than by their attire. This perspective leads them to view clothing as an unnecessary and confusing aspect of human civilization, which is deeply intertwined with social hierarchies and pretenses. Hence, the Houyhnhnms' bafflement arises from their fundamental values that prioritize reason and honesty, in stark contrast to the human tendency to attach significance to external appearances like fashion and clothing.