Po Lo-t’ien dug a little pool beside which he planted a few bamboos, which he cared for with love.  He wrote a poem about them:

The bamboo—its heart is empty.

It has become my friend.

The water—its heart is pure.

It has become my teacher.

Musō Soseki (1275 CE-1351 CE), Musō Soseki was a Rinzai Zen Buddhist monk and teacher, and a calligraphist, poet and garden designer. The most famous monk of his time, he is also known as Musō Kokushi (夢窓国師) ("national Zen teacher"), an honorific conferred on him by Emperor Go-Daigo.