In today’s world, artists, businessmen, engineers…all try to sell or promote their products by presenting a model since it demonstrates their ideas and expertise to the observers. However, no model can truly reveal the actual nature of the product. For this reason, each individual is a model for everyone else in Congress60; a street junkie who has been cured for a few years and is a successful person can be a positive model for a newcomer. Similarly, a heroin addict who is homeless can serve as a warning for cured addicts and reminds them of the eminent danger.