Think of art with -y added, the way English adds -y to mean 'smelling of that thing'. Arty is not 'making art'; it is 'giving off art'. A person can give it off in their clothes and their talk, a café can give it off in its bare walls, and a film can give off so much of it that you stop believing there is anything underneath. Same smell, different strengths.
可以想成 art 加上 -y，就像在「藝術」上撒了一層味道。來源資料的字源樹寫的就是 From art + -y。英文的 -y 常把名詞變成「有那個味道的」。所以 arty 不是在說「做藝術的」，是在說「散發著藝術味的」。人可以從穿著和談吐散發出來。一間咖啡店可以從空牆散發出來。一部電影也可以濃到讓你懷疑裡面是不是空的。同一種味道，差別只在濃淡。
From the word’s history
From art + -y, per the source etymology tree; the -y suffix turns the noun into 'having the flavour of that thing'.
來源資料的字源樹寫著 From art + -y。-y 這個字尾把名詞變成「帶著那個味道的」，所以整個字的意思一開始就是「一身藝術味」，而不是「從事藝術」。
Wiktionary entry for 'arty' (packet evidence, kaikki:3f6f69a190036ae4:1043346159): 'From art + -y.'
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