A single curve keeps showing up where life meets information: fast gains, then graceful stability. We follow that signature from metabolism and neuron firing to perception, learning, identity, and even institutions, revealing why exponents between 0.5 and 0.75 are the scaffolding of growth that lasts. Drawing a line from Fechner and Stevens to Kleiber and Hebb, we unpack how senses compress wild physical inputs, how synapses strengthen with diminishing returns, and how memory and skills mature without tipping into chaos. The same logic explains why epigenetic influence and cultural inheritance fade predictably across generations: systems integrate early and stabilize late to conserve energy and preserve coherence.

We bring that lens to psychology and argue that identity is the conceptual continuation of biological integration. The “0.6 law” surfaces as the mind’s way of turning a flood of experience into categories, values, memories, and meaning. That’s why agency scales when you compress wisely: you filter noise, protect structure, and prevent runaway activation. Along the way, we outline how communities become more than a network of relationships; they acquire communal selfhood when individuals align internal standards toward a shared, truth-tested purpose and continuously narrate their becoming across time.

Finally, we turn this into practice. We define what makes a unifying mental structure work—reduce complexity, preserve differences, avoid contradiction, and guide action—and show how development moves toward higher-order integrations as context expands. We spotlight the two failure modes, disintegration and misintegration, and the institutional patterns that either compound growth or hollow out purpose. If you’ve felt the rush of early progress followed by steadying returns, you’ve lived this law. Subscribe, share with a friend who loves deep structure, and leave a review with one place you’ve seen the fast-then-stable curve in your life.

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