What is the fine-grained topic of the following text: But perhaps the most relevant linguistic evidence for today’s post is that we call the dark circular opening in our iris a pupil, from the diminutive form of the Latin word pupa, meaning doll; it is so named because we see a tiny version of ourselves and the world reflected in the curve of the eye. Only return the topic.
The etymology and meaning of the word "pupil" in relation to the eye.