Iain M. Banks' Excession (1996) is the fifth novel in his celebrated Culture series , shifting the series' focus from human agents to the internal lives and social dynamics of the Minds —the benevolent, hyper-intelligent AIs that govern the Culture's post-scarcity utopia. The "Outside Context Problem"
While the Culture is effectively god-like compared to most species, the Excession possesses technology that dwarfs their own, throwing the Minds into a mix of strategic panic and scientific awe. Key Factions and Characters Banks, Iain - Culture 05 - Excession
The central plot revolves around the sudden appearance of the "Excession," a mysterious, 50-kilometer-wide black-body sphere older than the universe itself. Banks uses this to introduce the concept of an : a challenge so completely outside a civilization's experience that it cannot be anticipated or effectively countered. Iain M