Imagine that the integrity of who we are is sustained by the four walls of a tin box; we are these metallic boxes. How much we are changed depends on the amount of impact impressed by the hammering forces of the external world and how well our barriers are constructed. The substance with which we use to build our framework then determines how affected, vulnerable, and resilient we are in the face of external influences. We can allow the world to arbitrarily shape and mold us, or we can completely barricade ourselves behind an impenetrable fortress. Alternatively, we can build ourselves with a substance permeable enough to allow a degree of integration with the external world and flexible enough to change form without losing memory of its original shape.