It is clear that the Government of the Chinese People's Republic is very concerned about national defence and possible foreign attack – especially from the United States, but increasingly from the Soviet Union also. Obviously, such concerns are largely relatable to both historical and current political and military realities – such as 100-odd years of western and Japanese encroachments on China, the Vietnam war, American military bases around China, Chinese-Soviet border clashes, and both ideological and practical political conflicts between China and the United States, and China and the Soviet Union. At the same time, however, these practical realities alone cannot provide a full basis for understanding the nature and strength of Chinese concerns about potential invasion. In the first place, such attitudes are both too deep and too wide. Traditionally, from long before the West became powerful in Asia, China has been concerned to keep foreigners out or at least carefully restricted, and long before the bitter attacks by the Chinese Communist Party (CCP) on “cultural imperialism” this concern extended to economic and cultural as well as direct military or political influence. Second – more generally, but more fundamentally – political behaviour and attitudes are never so neatly and completely rational and compartmentalized as to depend only on the “real” political circumstances. As with anyone else, both what the Chinese perceive as “real” and as “political,” and the significance attributed to these perceptions, depends also on the lenses they use to view the world. And the nature of the lenses used to view international affairs may be shaped by matters that at first seem remote from international relations, and by unconscious and emotional as well as conscious and rational calculations.