Mosaic novel
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A mosaic novel is a novel where individual chapters are written by different authors with the aim of telling linear story from beginning to end however with the individual chapters refracting a plurality of viewpoints and styles.
Examples of mosaic novels as opposed to short story collections set in a shared universe would be the Wild Cards series begun by George R. R. Martin and the Thieves World series of Robert Lynn Asprin and others. Thieves World overtly used and may have coined the term mosaic novel for this practice of sharing a world and vision amongst several authors.