Magnum opus

A magnum opus or chef-d’œuvre is an artist's or other person's best painting, song or other art, such as literature. It is Latin for "great work."

Magnum Opus Media

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  In painting, Leonardo da Vinci's Mona Lisa (c. 1503–06) is considered an archetypal masterpiece, although it was not produced for admission to a guild or academy.

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  Things Fall Apart by Igbo author Chinua Achebe is often considered a literary masterpiece, and one of the greatest works of Nigerian literature.