Calpurnia is still puzzled by the concept of things inside socks, i.e. "feet." This peculiar feature of her personality goes all the way back to her wee months, when she lived with me in a very cold apartment in rural Indiana. Once the weather got warmer and I started walking around barefoot, she thought something pink and soft and weird had eaten part of my body.
Now I've further complicated her understanding of human feet by getting a pedicure. She sits at the bottom of my bed staring at my feet with even more wariness than before. Imagine if I slipped a little shiny toe ring on there, and wiggled it to and fro. Her little baby mind would be totally blown.