Final answer:
The researcher's experience of returning home after conducting fieldwork is an example of cultural shock and demonstrates beginner's mind.
Step-by-step explanation:
The researcher's experience of returning home after conducting fieldwork with an indigenous tribe in Papua New Guinea and viewing his own society from an outsider's perspective is an example of cultural shock. Culture shock refers to the disorientation and frustration that people may experience when encountering a new culture or returning to their own culture after being immersed in a different one.
Through this experience, the researcher gains a new understanding of his own society, demonstrating the concept of beginner's mind. Beginner's mind refers to approaching a situation with an open and curious attitude, free from preconceived notions and biases.