In November of 1916, Edward Thomas sent a draft of "The Long Small Room" to Eleanor Farjeon. After receiving her comments on the poem, Thomas wrote back:
"I am worried about the impression the willow made on you. As a matter of fact I started with that last line as what I was working to. I am only fearing it has a sort of Japanesy suddenness of ending. But it is true, whether or not it is a legitimate switch to make."
Edward Thomas to Eleanor Farjeon (letter postmarked November 15, 1916), in Eleanor Farjeon, Edward Thomas: The Last Four Years (1958), page 221.
The Long Small Room
The long small room that showed willows in the west
Narrowed up to the end the fireplace filled,
Although not wide. I liked it. No one guessed
What need or accident made them so build.
Only the moon, the mouse and the sparrow peeped
In from the ivy round the casement thick.
Of all they saw and heard there they shall keep
The tale for the old ivy and older brick.
When I look back I am like moon, sparrow and mouse
That witnessed what they could never understand
Or alter or prevent in the dark house.
One thing remains the same -- this my right hand
Crawling crab-like over the clean white page,
Resting awhile each morning on the pillow,
Then once more starting to crawl on towards age.
The hundred last leaves stream upon the willow.
Edna Longley (editor), Edward Thomas: The Annotated Collected Poems (2008).
The final line that Thomas worried about is, of course, beautiful. It was certainly well worth "working to" once Thomas had found it. After all, it passed his ultimate test, the test that causes us to remember his poetry: "it is true." And the line does, to use his words, give the poem something of a "Japanesy suddenness of ending." (I would also suggest that the ending is reminiscent of a number of Chinese poems from the T'ang Dynasty.) It is not likely that Thomas had any translations of Ryokan's poetry available to him, but the following poems perhaps provide a hint of what he was speaking of.
My gate has been unbolted for many days,
Yet no sign of anyone entering the peaceful garden.
The rainy season is over, green moss is all around;
Slowly the oak leaves float to earth.
John Stevens (translator), One Robe, One Bowl: The Zen Poetry of Ryokan (1977).
Returning to my hermitage after filling my rice bowl,
Now only the gentle glow of twilight.
Surrounded by mountain peaks and thinly scattered leaves;
In the forest a winter crow flies.