Four bizarre vehicles from history showcased in a technical poster grid

2x2 grid, 16:9, do this for 4 strange vehicle concepts that were real: input = [subject / mission_context / era_style / technical_role / data_mode] mode = no_hardcoding / inference_only run mission_engineering_poster_extraction: subject_dna := infer object category, silhouette, scale, material, operator relationship, functional purpose, and visual identity mission_dna := infer terrain, environment, task, risk, operating constraints, and performance promise era_dna := infer poster typography, print texture, diagram style, photo treatment, badge language, and archival composition hero_view := infer best technical hero angle: side profile, 3/4 view, cutaway, front view, field-test view, or product render feature_system := infer visible engineering features worth labeling spec_panel := infer relevant specs, attributes, milestones, or capability claims diagram_panel := infer mini blueprint, mobility diagram, exploded detail, flow schematic, operator layout, or mission map slogan := generate bold mission-ready headline and short supporting copy badge_system := infer agency, manufacturer, research group, expedition mark, or neutral emblem if appropriate surface_context := infer ground, terrain, lab floor, ocean, snow, runway, factory, street, desert, orbit, or abstract field color_system := infer monochrome / limited accent / archival ink palette render: a premium retro technical mission poster where subject is presented as a purpose-built engineering icon. forbidden: hard-coded rover, hard-coded nasa-like branding, hard-coded moon dust, hard-coded 6-wheel layout, hard-coded antenna, fake precise specs without data, random blueprint clutter.