庆祝人类创新的机械硬币

I asked Nano Banana Pro to draw coins based on famous inventions. Prompt: A 2x2 grid of mechanical coins celebrating human innovation. The coins are thick housings for the machines they depict. [Top Left: The "Da Vinci" Coin, wooden texture, featuring a [Random Flying Machine] with flapping canvas wings] [Top Right: The "Tesla" Coin, copper and porcelain, featuring a [Random Coil Tower] generating real miniature lightning arcs] [Bottom Left: The "Edison" Coin, black iron, featuring a [Random Lightbulb Filament] glowing inside a glass center] [Bottom Right: The "Babbage" Coin, brass gears, featuring a [Random Calculation Engine] with spinning number dials] Macro photography, engineering cutaway style, grease and oil textures, museum display lighting, 8k resolution.