The field has also drawn somewhat on writers on miltary strategy, such as Clauzwitz, Liddell Hart, Sun Tzu, Machiavelli, and Mao Tse Tung.

• 在进桃花源的时候,渔人所见到的洞被安排成"一线天",因为蔡皋不想让洞口看起来黑洞洞,使人压抑。