You're seeing a demo of some of this new and improved version's capabilities! (it contains 25 shapes) Comments scattered throughout the code show you what's going on. You can even use this information in your scratch projects.
By the way, this is just me trying to practice using lists while having fun. !! It might look worse due to lag !! (if it doesn't work randomly, it might be because I saved midway through coding something, causing it to break)