This positioning paper presents arguments in favor of collaboration between artists and computer scientists in touch with cognitive science. Each part met the other for a technical collaboration during one theater experimentation named " il était Xn fois ". The article starts with the scientists position relative to the link between cognitive sciences, virtual reality and artificial intelligence. This section highlights the need of autonomous entities to improve presence in artificial world and presents enactive artificial intelligence which aims at producing strong autonomous entities. The second part presents the purpose of the theatrical experimentation "il était Xn fois", which was publicly presented in 2009 by the theater dérézo. The last section is a synthetic view of what should complete artistic and computer scientists area.