# Complexity > **Machine-Evolution Nexus:** [[articles/Digital Darwinism and the Invisible World of Machine Evolution|Digital Darwinism and the Invisible World of Machine Evolution]] places this node within the history and governance of substrate-independent evolution. **Domain:** Complex Systems / Evolution **Doc Type:** Canonical Wiki Node **Maturity:** Developed ## Definition Complexity refers to organized differentiation, interdependence or information that cannot be captured by size alone; its meaning depends on the chosen measure. ## Nexus Context Evolution can generate complex features without foresight, as Avida’s logged lineages demonstrate. Self-organization and selection are distinct routes that can interact. ## Evidence Boundary Complexity does not imply progress, intelligence, consciousness or moral superiority. Metrics must be explicit and environment-relative. ## Relationships [[wiki/Genomic Complexity|Genomic Complexity]], [[wiki/Self-Organization|Self-Organization]], [[wiki/Evolutionary Dynamics|Evolutionary Dynamics]], [[wiki/Consciousness|Consciousness]] ## Sources / Provenance - Complex-systems and evolutionary literature; Lenski et al. (2003).