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Constraints play a crucial role in the emergence of complexity. In the author's view, context-independent constraints set the boundaries of possibility space, while context-dependent constraints take a system away from independence and create the conditions for self-organization. One example of context-dependent constraint is the Bénard cell, where a pan of water heated from below undergoes a phase transition and forms self-organizing convection cells. Auto-catalytic networks in living systems also represent a closure of constraints that enables self-perpetuation and reproduction. The architecture of biological systems, such as the circulatory system, can also be seen as scaffolding that guides and supports function. Scaffolds provide temporary equilibrium points from which the next step can be more easily taken, similar to how ratchets provide temporary stability. Overall, constraints in various forms are essential in shaping the behavior and dynamics of complex systems.