Catalina is talking about her experiences in pottery class. "at first i had a really hard time getting the clay centered on the wheel. then i'd finally get it centered, but the pot would collapse when i tried to pull the walls up. (she laughs.) it was really frustrating, but i just kept practicing over and over. i am doing better now than i did at the beginning of the semester." from her comments, it is clear that catalan has a: