Plenty of stratigists were seen around this time period waving around their feather fans. The purpose of such fans were to increase thinking ability. For example, when Zhuge Dan was being bullied by Jia Chong, he used his fan to cover his face, and he thought for a moment. Then, with the power of thinking, he came up with a brilliant plan! Zhuge Dan dressed Hua Xiong in his own clothes and sent him out to see Jia Chong. Jia Chong bullied Hua Xiong relentlessly and then ordered Sima Zhao to execute him. When they realised that it was only Hua Xiong, Jia Chong felt very embarrassed and he became ill. The plan worked perfectly.