Pluriverse, the final work of the American poet and philosopher Benjamin Paul Blood, was published posthumously in 1920. After an experience of the anaesthetic nitrous oxide during a dental operation, Blood came to the conclusion that his mind had been opened, that he had undergone a mystical experience, and that he had come to a realisation of the true nature of reality. This title is the fullest exposition of Blood’s esoteric Christian philosophy-cum-theology, which, though deemed wildly eccentric by commentators both during his lifetime and later in the twentieth century, was nonetheless one of the most influential sources for American mystical-empiricism. In particular, Blood’s thought was a major inspiration for William James, and can be seen to prefigure the latter’s concept of Sciousness directly.