Suppose there is a team meeting and the group is going to discuss the issues associated with a topic, design something or a solve a problem.
For any given complex problem, there are a variety of perspectives and views that can be considered. However, habitually, everyone will only look at his own view, aiming to push his own agenda. This leads to a situation where the group may end up responding to the loudest person who talks the most and is naturally biased towards a particular perspective rather than considering overall important concerns.
This exercise helps the team to view the problem from a variety of perspectives that they usually tend to ignore in favour of their own.