In this article, "physical" models and ideas are invoked to describe some overall aspects of intercultural interactions. It is emphasized, however, that actual intercultural interactions are much more complex than any physical or mathematical model can encompass. They constitute, in fact, just one more example of what scientists call "complex systems." These ideas are applied to the following examples: (1) Stuart Hall's "The West [versus] the Rest" and Samuel Huntington's "weltanschauung"; (2) interactions through Science and Technology as well as "Science Diplomacy," focusing on Silk-Road interactions. The article is concluded with a partial list of "necessary" conditions conducive to constructive intercultural interactions, although these cannot possibly be "sufficient." The wider implications for Cosmopolitan Education are also underlined.