...`Mine is a long and a sad tale!' said the Mouse, turning to Alice, and sighing.
`It is a long tail, certainly,' said Alice, looking down with wonder at the Mouse's tail; `but why do you call it sad?' ...

Lewis Carroll, "Alice's Adventures in Wonderland"

むかしむかしどこかにぼくがいた
いまここにぼくはいる

谷川俊太郎『はだか』「むかしむかし」より