Some maps serve as a source of amusement and curiosity, but many others touch upon serious historical and cultural topics. They're tools Yap can use to organize his thoughts and address topics in his research.
除了自娛娛人的趣味性作品之外，也有許多作品涉及嚴肅的歷史社會議題，是葉高華在學術研究過程中，協助自己整理思緒、探索議題內容的工具。