Serious, yet playful

internalized
personal or subjective, being an integral part of one's attitudes or beliefs

pragmatic
concerning actual occurences, facts or everyday matters, practical

construction play
a type of play based on using building blocks in order to construct something; it sharpens child's mind and enhances dexterity, spatial thinking and creativity.

social scripts
society's patterns of appropriate behaviour

a healthcare environment
the healthcare system with its facilities and healthcare workers