In the tradition of the Ancients such as Heraclitus, it is the zeitgeist of the unreality of the mind/body theory of Descartes, where he describes reality as a non-thing, a posteriori as it is, thus, as anybody can see, the spider just fell off its perch when it went to sleep.
In the tradition of the Ancients such as Heraclitus, it is the zeitgeist of the unreality of the mind/body theory of Descartes, where he describes reality as a non-thing, a posteriori as it is, thus, as anybody can see, the spider just fell off its perch when it went to sleep.