Ready to storm an evil villain's castle? Look no further because a miniaturized giant crossbow is exactly what you need! Introducing Leonardo Da Vinci's crossbow, a fantastic kit perfect for your siege needs. Learn about engineering simple machines with this STEM building kit. Once built, you can launch mini projectiles and defeat those pesky beasts. The renowned Renaissance artist Leonardo da Vinci was also a scientist, architect, engineer, and inventor. While we may have put this through an inshrinkerator, it would have been an intimidatingly giant crossbow or “ballista”. His design of a complex system of gears and pulleys, showcased his deep understanding of engineering and mechanics.