boat and beaver

I finished that beaver puppet I was working on, and finally got around to taking a picture. 

Now I'm building a boat. It's almost finished, I just have to attach the mast and the sail at this point. Mr. Tusks was less helpful than usual on this project, which was great. 

Below is an experiment which involves me saving a bunch of trash, as do most of my experiments. Can you guess what it's for?