One meditation teacher invites us to envision the true nature of our mind as a clear blue sky. Thoughts, feelings, sensations, and perceptions are clouds that come and go across the blue sky. Some clouds are white wisps, others dark gray thunderheads. Sometimes the clouds are few; sometimes they reach from horizon to horizon. Yet, however many clouds may obscure the blue sky, the blue sky is always there. Just as a small patch of blue often appears during a hurricane, the blue-sky true nature of our mind/heart can reveal itself through the clouds of thinking, feeling, and perceiving, no matter how dense they become.Envisioning our thoughts and feelings this way can help us let go of the impulse to try to control our mind. Control is not necessary because the blue sky is just there. We don't have to engineer it in any way.