Frames featuring the blue? (9)

I believe the answer is:

seascapes

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'frames' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Perhaps there's a link between them I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for seascapes that I've seen is " Maritime paintings".)

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