What is the importance of the "Circle of Safety" in the nonfiction book, Leaders Eat Last?

The Circle of Safety is the protective perimeter that a leader creates around his employees. The employees feel safe and feel they belong in this circle. They feel the protection of their leader and feel free to speak up – even admit mistakes. The Circle of Safety can only exist through mutual trust, the sharing of information and a willingness to coordinate their efforts with other team members. If a leader is caught lying or being duplicitous, the Circle of Safety will burst and become dysfunctional.