Author Nick Mamatas uses Ylem as multiple realities or fates in the novel Bullettime, ChiZine Publications, 2012.
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Ylem is a term that was used by George Gamow, Ralph Alpher, and their associates in the late 1940s for a hypothetical original substance or condensed state of matter, which became subatomic particles and elements as we understand them today.
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The 2012 Frank Zappa release Finer Moments (in line with the 2012 remasters/reissues of his core discography) bears the phrase "This is Zappa Family Archival Matter In Living Ylem" on its back cover.