Natasha relates people to colors and shapes, is this a form of synesthesia, could Tolstoy have had this, too? It would fit with the ongoing theme of perception.
“You flirt with him too,” (Pierre): FORESHADOWING!
Tolstoy writes young women so well, all their energy and active minds, but also the childlike in them, too. Natasha in her youth is such a wonderful character because we can feel how alive she is