Bodhidharma and a bit about Takujū Kosen Zenji

Above is the "Bodhidharma" of Takujū Kosen (卓洲胡僊; 1760–1833) - one of my favorites in genre.

Takujū Zenji is an important teacher in the Rinzai lineage of Harada Sogaku Rōshi in which Takujū is the third ancestor after Hakuin (following Tōrei and Gasan). He played a key role in the development of the kōan curriculum that we use today.

Here is Richard Bryan McDaniel's rendering of Takujū's bio in brief from Zen Masters of Japan: The Second Step East:

Takujū Kosen was twenty years old when he came to study with Gasan. The master assigned him Joshu’s Mu!, and the young man threw himself into the practice. He requested permission to retire from the monastic community to a hermitage in order to dedicate all of his time to the kōan. He practiced with such fervor that at one point he went for more than two weeks without either food or sleep. As a result of his efforts, he was able to attain kenshō within ninety days.

After completing his training with Gasan, Takujū spent another twenty years in further solitude, deepening and integrating his understanding. Then he succeeded Inzan as abbot of Myōshinji.

Both Inzan and Takujū were effective teachers, but what commentators—such as the American Zen teacher Bernie Glassman—note was the difference in their personalities: Inzan and Takuju had completely different personalities. Inzan was vigorous, very dynamic; Takujū was meticulous, very careful in his study. And thus two kōan systems developed, having the characteristics of each teacher: one very dynamic, and one system requiring you to be very meticulous in examining all elements of each point of a kōan.

The majority of Rinzai teachers today are direct Dharma descendants of one or the other of these two men, making use of the different approaches Inzan and Takujū took to kōan study.