The Reason Musubi closely resembles René Descartes' idea of solipsism, a philosophy of the solitary self which is based in individualism and solitude.
It is the last of the "Lazarus Long" cycle of stories, involving time travel, parallel dimensions, free love, voluntary incest, and a concept that Heinlein named pantheistic solipsism, or World as Myth — the theory that universes are created by the act of imagining them, so that somewhere (for example) the Land of Oz is real.