Zen Koan

A monk asked Joshu, "What is the meaning of Bodidharma's coming to China?" Joshu said,
"The oak tree in the garden."
A monk asked Zhaozhou, "What is the living meaning of Zen?." Zhaozhou said,
"The cypress tree in the yard."

Case 37 from the Mumonkan (Wumenguan), A Traditional Collection of Zen Koan
'Joshu, Chao-chou, Zhaozhou' are different spellings of the name of a Chinese Chan (Zen) Teacher