translation.en: Victorians thought the waves had to be waves in some material medium: the ether. But we find real matter comforting only because we've evolved to survive in Middle World, where matter is a useful fiction.
translation.zh: 维多利亚时代的人们认为波只能在以物质作为介质的环境下存在， 我们管这种介质叫以太。但是真实的物质能够让我们宽慰 是因为在我们生存的中观世界中， 物质是一个有用的虚构概念。