Exteriors varied. Different colors, different shapes, different sizes. Each unique. Each a universe unto itself. What emanates from within? What can be known about the core? How does the shell move? How does the shell communicate? What makes it tick? A ghost. There is a ghost within. A ghost in the shell. The ghost, invisible. Cannot be seen, it is there but, cannot be located. The ghost motivates, brings the shell to life. Communicates, interacts and creates. The ghost makes things happen. The world is full of shells. The world is full of ghosts. When the core ceases to exist, the invisible remains invisible. Where it goes? Nobody knows.