A remarkably complex and detailed spec-bio project, with a focus on an alternative history where early 20th century ideas about the ecosystems of Mars turned out to be much more accurate than in our version of events. But it's not just a chronicle of the biosphere of the red plant; Har Deshur dives into the ecology, biogeography, evolutionary history, and the cultural impact on humanity, whilst somehow also finding time to consider other alt-history options, such as life on Venus, the satellites of Jupiter, and the discovery of the mystery inner planet Vulcan that had been speculated (including how it stayed hidden).

I've barely scratched the surface of this intriguing project, and am interested to see where it goes next.