Rowan didn't seem to be too into using the play structure we setup for him - other than the swings from time to time. I thought adding in a ball drop would help make it more interesting. I also added in a nifty bucket / pulley system to get the balls back up top without leaving the fort area. Materials: 2" PVC Conduit ( cut in half ), PVC elbows, Bucket, Rope, Pulleys.