Aparigraha

Nonattachment. The ability to experience life without forming unhealthy attachments.
Before I even speak about attachment, let me be clear. In my opinion there is no such thing as being completely detached.
In our yoga practices, we work toward a pose. We have seen others who can execute the pose in a certain way that we would like to emulate, so we attempt the pose. If we attach to the pose that we have seen on someone else, this can be a frustrating practice -- as no two bodies are alike. But if we can detach from the picture in our head of how we want this pose to look, we can allow ourselves to explore the pose in each moment in our bodies and in our realities. We can have a deeper and more meaningful experience of the pose and of our practice. In teaching, I will often say that the energy of a movement or pose is "such," but we may never arrive at the place we think we are going. The journey, the practice is the point, so attachment to the outcome is not. 
Also in life, if we attach to a person or an outcome, we will often miss the moments, the connections the journey. 
None of us are perfect beings. In aparigraha, we work toward presence. 

Namaste,
Lisa