Team building allow leaders and team members to gain a micro-view of people in situational transactions. When involved in these situational transactions people can see how others and themselves, think, act, handle conflict, handle long and short term delegation of tasks, are able to view the team as a whole, as well as how the individual works and treat others in projects.
This is powerful because rarely is the opportunity given for teams to explore and objectively view a project take place where all team members are present in real-time and are then led through processing and reflection to highlight and explore the strengths of the individuals and the team while involved in work.