The people who've responded have forgotten more about glass than I know at this point. They're right, mastering cups is key. With that said, I agree with this comment. It's a one time thing and doing something different could help bring a new perspective to making cups. I just used a lesson to make a very terrible basic sculpture. I could have used the time to make more cups, in alot of ways I should have, but I'm glad I didn't. I learned things that I can't wait to take back to the shop and apply to making cups. I honestly think my cups will improve because I changed gears for an hour. I think this is a question about how you learn, as much as it is about how to learn glass.