Part 1 Foundations: introduction; the era of decentralization. Part 2 Constructions: constructionism; LEGO/logo; StarLogo; objects and parallelism. Part 3 Explorations: simulations and stimulations; slime mould; artificial ants; traffic jams; termites; turtles and frogs; turtle ecology; new turtle geometry; forest fire; recursive trees. Part 4 Reflections: the centralized mindset; beyond the centralized mindset. Part 5 Projections: growing up. Appendices: student participants; StarLogo overview.