Zoe speaks to people’s anxieties in regards to telling things apart. Marco suggests that it’s extremely unsettling to not have any rules or delineations of what happens where, indicating that it’s a natural human inclination to want to sort things into neat categories and make them fit. However, this is impossible to do in Zoe, just as in the novel itself, suggesting that while such an urge may be normal, it’s not always fruitful to follow through. No matter what, places that can’t be categorized, to a person intent on categorizing, are unsettling and can’t be understood.