This is a suite of variations on the possibilities of different kinds of afterlives. Each of the forty tales is usually only about a couple of pages long, but each one is densely packed with mind-bending what-ifs. He imagines wildly different ways that an afterlife, if it existed, could be structured. Some are exquisitely sad, such as this first paragraph from 'Metamorphosis': "There are three deaths. The first is when the body ceases to function. The second is when the body is consigned to the grave. The third is that moment, sometime in the future, when your name is spoken for the last time." Others offer the possibility of a sublime eternity, in which the self is split into an infinite set of selves, as in a prism, which exist simultaneously, and interact, as multiple versions of the self at different ages, meeting together periodically at reunions.
This is one to re-read, in parts, randomly. Delightful.