This document discusses the sociological concepts of self and other, and how group boundaries are perceived and constructed. It outlines an activity where participants will play an "imitation game" to test their ability to determine if someone belongs to a social group or is pretending. It also includes a minds-on discussion about how categorization can lead to stereotyping and reductionism, but also provides cognitive benefits. The goals are to think critically about strategies for determining social group membership and to promote mutual understanding between groups.