brain
the biological organ of computation. ~86 billion neurons connected by ~100 trillion synapses, running on ~20 watts. the most complex known structure in the universe
the brain is where sense becomes knowledge, where memory persists, where consciousness emerges. every modality — vision, hearing, touch — has dedicated cortical areas that process raw sensation into structured experience
predictive coding: the brain is a prediction machine. it models the world and corrects against sensory input. perception is controlled hallucination