My bubbles!
Children adore bubbles. Everyone is aware of that. Little boys are kids, regardless of their status, thus it doesn’t matter if they’re princes or just regular boys. This means that George would respond to a bunch of bubbles just like any other child would, and this cute picture shows it.
The character in Finding Nemo who attempted to keep all of the bubbles in the fish tank to himself appears to be just as fascinated by these floating bubbles as he is.