# Hiroki Sayama > **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:** Artificial Life / Complex Systems **Doc Type:** Canonical Wiki Node **Maturity:** Developed ## Definition Hiroki Sayama is a complex-systems and artificial-life researcher who created Evoloops and studies self-organization and evolutionary dynamics. ## Nexus Context His 1999 system introduced imperfect loop copying and spatial competition; his retrospective with Chrystopher Nehaniv evaluates twenty-five years of progress and open problems. ## Evidence Boundary Evoloops constructively demonstrate Darwinian dynamics in their artificial world; they do not establish digital consciousness or unlimited open-ended evolution. ## Relationships [[wiki/Evoloop|Evoloop]], [[wiki/Chrystopher Nehaniv|Chrystopher Nehaniv]], [[wiki/Open-Ended Evolution|Open-Ended Evolution]], [[wiki/Deterministic Cellular Automata|Deterministic Cellular Automata]] ## Sources / Provenance - Sayama, _Artificial Life_ 5 (1999); Sayama and Nehaniv, _Artificial Life_ 31 (2025).