In the Chinese historical novel Romance of the Three Kingdoms, author Luo Guanzhong describes the “Empty Fort Strategy,” a use of reverse psychology to deceive the enemy. When 150,000 troops from the Wei Kingdom reached Xicheng, which had less than 2,500 soldiers, they found the city gate wide open and the famous military tactician Zhuge Liang calmly playing the zither with two children beside him. The Wei general, baffled by the scene and believing it was an ambush, ordered a full retreat.