Here are a few lines by the Tang dynasty Chinese poet, Li Po, (also known as Li Bai – 701-762). He could be talking about sitting meditation, and probably he is.
The birds have vanished into the sky,
and now the last cloud drains away.
We sit in zazen, alert and mindful, observing thought-birds and feeling-clouds fluttering across our sky-mind. Through the window we can see a mountain, it fills our perceptual field.
We sit together, the mountain and me,
until only the mountain remains.
[the whole poem is in Hamill & Seaton 2007: 42 – see biblio.]