Leonardo da Vinci sketched the Architonnerre, a hypothetical steam-powered cannon, in his notebooks, demonstrating his fascination with the power of steam. The device was designed to use the rapid expansion of steam to propel a projectile. While never built, da Vinci's sketches show the application of steam in a military context, reflecting the Renaissance interest in both art and warfare.

Da Vinci's notebooks are a treasure trove of ideas that have fascinated poets and writers for centuries. His vision of a steam-powered cannon is a blend of art, science, and military technology that reflects the Renaissance ideal of the 'universal man.' His sketches have inspired countless works of fiction and poetry, symbolizing the boundless potential of human creativity.