Working in an Intercultural School is one of the most inspiring, motivating challenges an educator can be given in any given society, but that was especially true for Greece at the beginning of the last decade, since it was only in 1996 that the term Intercultural Education was introduced. Partly due to chance, and partly due to personal and professional curiosity, the author sought to find ways to implement in the most effective way the project "Olympic Education," which preceded the Athens 2004 Olympics in one of the four Intercultural senior high schools (Lyceums) in Elliniko, Athens. There is one activity that even today, after more than 10 years, stands out in the author's mind, mainly because of the difficulty faced due to the aggressive reactions of some of the students while implementing it. This particular activity was called "Creating a common world." The educational objectives of the activity were for students to gain knowledge about different cultures and countries, and to cooperate with each other to create their own common "culture.". The activity is described in this article.