@Saville that really hits the nail on the head. In the meditation tradition that I am following, the bubble is described as a cocoon. We retreat into the cocoon and shut out the feelings and experiences of the world. The more we do it, the more solid the walls. When we choose to do otherwise, to venture forth from the warmth and safety of the coccoon, we begin to weaken the walls that shut us in. But to do this requires bravery, each and every time. It is never easy but can become easier.