I suppose that after more than a thousand reviews, it's fairly obvious this blog has a soft spot for literary novels which utilize the devices of fantastika. A full course meal with spice, most do not appear so profound on the surface, yet the more one unpacks the details, the deeper they become—a depth made more engaging for the touches of the impossible or not-yet-possible. Thus, while Brian Aldiss' 1968 Report on Probability A would seem a dull voyeurism, the more one seeks out the connections between its pieces, the broader is potential meaning spreads, and becomes a highly engaging thought piece.
Plot subtle and fragmented, Report on Probability A is not rip-roaring, space-faring, alien-shootin' science fiction. But I would say it writes the book (har-har) on parallel universe stories. Ostensibly about a group of people on one planet watching the lives of a handful of people living on one British street, it digs into another layer: the handful of residents likewise peer into the lives of those around them—reality through a fractured lens.