Objects found or already existing outside of the context of art, which are used as component parts in a work or to create an entire sculpture, are called

They are are called "Readymade"

Explanation:

Readymade are objects which are found or already existing outside of the context of art, which are used as component parts in a work or used to create an entire sculpture.

Also readymade are ordinary manufactured objects that artist selected and modified as well.

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