Sometimes the Evil Genius likes to go for that retro-look when creating his projects. Its hard to get much more retro than a medieval siege engine.
The trebuchet uses a weight attached to an arm with a sling on the end of it to throw objects. In its time, the projectiles varied, but were often big rocks or dead and rotting horses, thrown into the enemy fortifications during sieges. The Evil Genius’ trebuchet will not throw much more than a tennis ball, but it will throw it a decent distance and it’s a good project to work on if you like wood-work.