kōan; a story, dialogue, question, or statement in the history and lore of Zen Buddhism, generally containing aspects that are inaccessible to rational understanding, yet may be accessible to intuition, eg. "What is the sound of one hand clapping?"

a public issue, a standing problem; a cause célèbre; an issue or incident arousing widespread controversy, outside campaigning and/or heated public debate

Celebrated Cases of Judge Dee, Dee Goong An, Celebrated Cases of Judge Dee (lit. "Cases of Judge Dee") is an 18th century Chinese detective novel. It is loosely based on the adventures

of Judge Dee, a magistrate and statesman of the Tang court, who lived roughly

630-700. The Dee Goong An was translated by Robert van Gulik 高羅佩 into English and used as the basis for his own series of detective novels about Judge Dee: Judge Dee mysteries (source: Wikipedia)