Leonardo da Vinci is well known for his various talents that included painting, sculpting, astronomy, botany and cartography as well as a flair for the sciences. He was also an inventor who crafted or conceptualised a multitude of designs for tech well beyond its time. Some of these concepts included things like the parachute and an early helicopter. Considering he was doing this back in the 16th century (he was born in April 1452) it was a staggering feat indeed. One of these visions of future tech included a fighting vehicle that was essentially a modern tank inspired by a turtle's shell. The design for this tank included a call for reinforced metal plates to protect the occupants, slanting sides to deflect enemy fire and an array of light cannons. It could barely be built at the time, but was an interesting vision of the future of warfare.