There are stil several Koan unpublished in the internet or as printed material
I would like to say the Human mind is inexhaustible ,with Wisdom and Compassion , will show great insight and give impetus to new Koan in life
Koan is Great reflection from Dharma books .
Many of us used to think Wisdom must be injected intravenously, but the fact is it isnt
Seeing one true nature , one realise ones purpose in Saha world ,and will never live deluded

Note: If Your have noticed.I often use my own words first then I will show the relevant website ,its a critical practice to see how much my wisdom have deteoriate or improved

For other uses, see Koan (disambiguation).
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A kō•an (公案; Korean: gong'an, Japanese: kōan, Chinese: gōng-à n) is a story, dialogue, question, or statement in the history and lore of Chán (Zen) Buddhism, generally containing aspects that are inaccessible to rational understanding, yet that may be accessible to intuition. A famous kōan is, "Two hands clap and there is a sound; what is the sound of one hand?" (oral tradition, attributed to Hakuin Ekaku, 1686-1769, considered a reviver of the kōan tradition in Japan).
Contents [hide]
1 In brief
2 Examples
3 Roles of the kōan in Zen practice
4 Etymology and the evolving meaning of kōan
5 The role of kōans in the Soto, Rinzai, and other sects
6 Interpretation of kōans
6.1 The sound of one hand
6.2 The Gateless Gate
6.2.1 Case 1: Zhaozhou's dog
6.2.2 Case 2: Pai-chang and a fox
6.2.3 Case 6: Buddha holds out a flower
6.2.4 Case 7: Zhaozhou washes the bowl
6.2.5 Case 8: Keichu's wheel
6.2.6 Case 29: Huineng's flag
6.2.7 Case 37: Zhaozhou's cypress
6.3 Other traditional kōans
6.3.1 What is the Buddha?
6.3.2 Killing the Buddha
6.4 Contemporary kōans
7 See also
8 Notes
9 External links
[edit] In brief
Kōans originate in the sayings and doings of sages and legendary figures, usually those authorized to teach in a lineage that regards Bodhidharma (c. 5th-6th century) as its ancestor. Kōans are said to reflect the enlightened or awakened state of such persons, and sometimes said to confound the habit of discursive thought or shock the mind into awareness. Zen teachers often recite and comment on kōans, and some Zen practitioners concentrate on kōans during meditation. Teachers may probe such students about their kōan practice using "checking questions" to validate an experience of insight (kensho) or awakening. Responses by students have included actions or gestures, "capping phrases" (jakugo), and verses inspired by the kōan.
As used by teachers, monks, and students in training, kōan can refer to a story selected from sutras and historical records, a perplexing element of the story, a concise but critical word or phrase (話頭 huà -tóu) extracted from the story, or to the story appended by poetry and commentary authored by later Zen teachers, sometimes layering commentary upon commentary. Less formally, the term kōan sometimes refers to any experience that accompanies awakening or spiritual insight.
English-speaking non-Zen practitioners sometimes use kōan to refer to an unanswerable question or a meaningless statement. However, in Zen practice, a kōan is not meaningless, and teachers often do expect students to present an appropriate response when asked about a kōan. Even so, a kōan is not a riddle or a puzzle.[1] Appropriate responses to a kōan may vary according to circumstances; different teachers may demand different responses to a given kōan, and a fixed answer cannot be correct in every circumstance. One of the most common recorded comments by a teacher on a disciple's answer is, "Even though that is true, if you do not know it yourself it does you no good." The master is looking, not for an answer in a specific form, but for evidence that the disciple has grasped the practical use of the kōan in daily life, or in other words, has actually given up some previous attachment.
The word kōan corresponds to the Chinese characters 公案 which can be rendered in various ways: gōng'à n (Chinese pinyin); kung-an (Chinese Wade-Giles); gong'an (Korean); công-án (Vietnamese); kōan (Japanese Hepburn); often transliterated kōan). Of these, "kōan" is the most common in English. Just as Japanese Zen, Chinese Ch'an, Korean Son, and Vietnamese Thien, and Western Zen all share many features in common, likewise kōans play similar roles in each, although significant cultural differences exist
http://en.wikipedia.org/wiki/Koan