Unusual Car Design Ad Grid

2x2 grid, 16:9, 4 unusual inventions that are real STATES: S0: input_or_infer_vehicles( $ INVENTION_LIST ) → list of 4 unique real car models S1: for each vehicle: S1a: random_pick(3 eras from pool, 3 graphics from pool) without duplicate S1b: assign 60/30/10 (dominant/secondary/accent) S1c: generate campaign name, headline, provenance tagline using model & era S1d: render ad image with exact car identity, blending eras/graphics per hierarchy (dominant defines color temperature, layout; secondary adds paper/map elements; accent adds foil or stamp) S1e: enforce no fake numbers/awards, preserve historical plausibility S2: arrange four ad images into 2x2 grid (16:9 aspect) S3: final render as elegant heritage exhibition poster