💧 Schismatrix (1985) by Bruce Sterling is a foundational cyberpunk / post-cyberpunk novel set several centuries in the future, after humanity has spread throughout the Solar System. 

Schismatrix traces shifting power structures, techno-political factions, and posthuman experiments across habitats, asteroid states, and orbital societies. The novel explores identity beyond the human, evolution as ideology, and the instability of any technological orthodoxy—making it a crucial bridge between cyberpunk, transhumanism, and later post-cyberpunk currents.