As well as being an artist , Leonardo was a military engineer who drew many designs of weapons for the Dukes of his time. This bombard re-creates one of Leonardos iconic images of a cannon and exploding cannonballs. Launch small projectiles and re-live those whimsical Renaissance days!( Yes, we expect there was a good amount of whimsy back then!). It really works-but mostly to defend against invading Lego warriors!