Time to take over the world! Shoot projectiles (safe ones included in the kit!) at your foes, I mean toes. This ingenious working Ballista kit comes with everything you need to build an exciting piece of history. Precision cut wooden pieces and details instructions make building this kit fun and worthwhile. Zoink! Part of Copernicus Toys Curious Engineer line of building toys. Fun, hands-on learning at its best. Building models decreases stress, increases focus, organization, spatial and fine motor skills.