One way to hold this word: a thin, bright book on a low shelf, read aloud at bedtime. Inside it, the lost dog comes home, the friends make up, and the last page is happy. The object is one half of the word; the kind of ending that object promises is the other half.
storybook 的核心畫面可以想成矮書架上那本薄薄的、彩色的童書。睡前被唸出來的那一本。書裡走丟的狗會回家。吵架的朋友會和好。最後一頁一定是圓滿的。這個字有兩面。一面是那本書這個東西。另一面是那本書裡保證會出現的那種結局。
From the word’s history
From story + book: a book that holds stories, formed like notebook and cookbook.
Wiktionary 記為 from story + book，就是「裝故事的書」，跟 notebook、cookbook 同一種造字法。所以這個字最原始的意思就是那本實體的書，形容詞的用法是後來從書的內容延伸出去的。
Wiktionary 'storybook' etymology (kaikki extract, source_ref kaikki:3f6f69a190036ae4:1383562733:5074)
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