Picture a square of grass with a covered path running all the way round it. One side of the path is open to the garden; the other three sides are wall. You can walk for hours and never leave. That is the shape the whole word keeps: an inside you can move about in freely, and an edge you do not cross.
可以想成一方草地，外面繞著一圈有頂的走廊。走廊靠草地那面是開的，另一面是牆。你可以在裡面走上幾個小時，卻始終沒有出去。這個字後來的每一個意思都留著這個形狀：裡面走得很自在，但有一道邊界不越過。
From the word’s history
From Latin claustrum, an enclosed place, from claudere, to close — the same root as the word close. The name is about being shut in, not about the walk itself.
來自拉丁文 claustrum（關起來的地方），源頭是 claudere（關上），跟英文的 close 同一個老根。所以這個名字說的是「被關起來」，不是那條走廊本身——走廊只是那道封閉最好看的樣子。
Wiktionary etymology supplied in packet (source_ref kaikki:3f6f69a190036ae4:716285438)
登入就可以看每一支怎麼連回核心畫面。