In 1952, a psychologist built a machine that was never supposed to be intelligent — just a simple model of a neuron — and accidentally laid the first brick of artificial intelligence. But the real story isn't the invention: it's the sixty-year argument it started about whether a machine can ever truly understand anything, or whether we've been building very convincing mirrors all along. Frank Rosenblatt's Perceptron didn't just change computing; it cracked open the oldest question in science — what is a mind?