National Gallery collection (3)

I think it could be either:

Which length description are you looking for?:

art

(Other definitions for art that I've seen before include "Music, painting etc" , "''... is long and life is short''" , "Eg, paintings, sculpture" , "Skill in a specified thing" , "Work such as paintings or sculptures" .)

I've seen this clue in the LA Times.

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