He touched the small box attached to the back of his neck. About the size of an orange, he was told the control mechanism kept him safe, that is, as long as he obeyed its directives. Stay on the prescribed path, avoid areas to which he did not have security clearance, speak only when spoken to when around people who lacked his clearance level or higher. They appeared as purple in his viewer when lower, green or blue when the same or higher. There were a lot of purple people around him today, so he kept to himself and did nit interact with anyone, not even the blue girl in the corner. He wondered if he was purple from her point of view, or if there were levels that could talk to anyone. How else could orders be relayed from the top down? There was the controller box, maybe that was the only way an Upper could communicate with the Lowers.