It's only in math class where apples can turn into oranges and ice cream cones turn into cd discs. My professor was trying to get us to see a 3-d object in the fourth dimension. (Time is not the fourth dimension in math.) He started off by drawing an ice cream cone, and sliced it and turned it into a donut, and then he sliced that and turned it into a disc. Let's just say that by the end of class, I was and .