A poem by Shuji Tereyama.
(The original kanji is included in the translation to make the wordplay apparent)
I wrote down the word tree (木)
but it looked so pitiful all alone
so I added another tree (木)
and the trees became a forest (林)
When I look at the word lonely (淋)
I know why the trees are crying (涙)
It's just because when love begins
loneliness comes in
