One picture holds this whole word: something is lying flat and out of sight, and then, with a small noise, it is standing right in front of you. Open a pop-up book and a paper castle rises off the page. Nobody built it; the fold did the work. Every other use is that same moment moved somewhere new — onto a screen, onto a street, into a bag, into the air above a baseball field. Two things always travel with the picture: it arrives by itself, and it was flat a second ago.
From the word’s history
Wiktionary records pop-up as deverbal from the phrasal verb pop up — the noun and adjective were simply made out of the verb phrase. That is why every meaning still describes a movement rather than a thing.
字典記載 pop-up 是從動詞片語 pop up 直接轉成名詞和形容詞的（deverbal）。這解釋了為什麼它的每個意思講的都是一個「動作」而不是一種「東西」：不管是紙城堡、彈窗、快閃店還是高飛球，共同點都在它們冒出來的方式。
Wiktionary entries for pop-up (adjective and noun), supplied in this packet: etymology_text 'Deverbal from pop up.' (source_ref kaikki:3f6f69a190036ae4:1009989232 and :1009994271)
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