For my very first engineering class at Duke, our final project was to create this marble track machine contraption in a team of 12 people. We were split into 4 subteams of 3 people each and, although building the device itself was enjoyable, working together with the rest of the team was the most impactful element of this project. In the end, everyone pulled through and every link of the chain was a success.
I was responsible for the cannon pictured below. See more pictures here