The physical-product extension of vibe coding, popularized around a September 2026 demo where a builder had GPT-6 Astra design a DJ controller end to end — concept image, part sourcing, datasheet reading, CAD model, order placement, and an assembly animation. It carries the same trade-off as vibe coding, sharpened by real money and real safety stakes: fast iteration on a design in exchange for skipping independent verification of specs like voltage, tolerances, and part compatibility before assembly.