Katya is learning about gravity; Mrs. Porcupyn is trying to explain that all objects exert gravitational pull against each other. I had to step in to clarify some things that, thankfully, I still remember from my undergrad education!!
Just like Hiranyakashipu points to different objects and asks Prahlada: “Is God in this object?”, similarly I was being asked whether books, animals, planets etc. exert gravitational pull!