The following article brings to mind Montessori classrooms and outdoor spaces.

European children are taught how to interact quietly to avoid bothering people around them.
“We learn these skills from a young age. My daughter’s 5th grade class (at a public school in Berlin, Germany) practices what they call their “one meter” voices: students are expected to sit with a partner and engage in quiet conversation. They are supposed to be able to hear each other, but not be heard more than one meter away. This allows other conversations to take place around them, creating an expectation of privacy and personal space in a crowded room.”