Most katas I've done have a symmetry to them, in that for the most part you do the same thing to the right as you just did to the left. They aren't perfectly symmetrical, in that the forward-backward movements are not always mirror images, but they are pretty close. They also tend to end where you started, if not a little bit behind, which is a good way to tell if you're doing something wrong (actually was really helpful in class the other day to figure out what was wrong with someone's 3rd Dan form). I've seen other arts where the forms are simply a long string of techniques with no attempt to reconcile with the earlier techniques in the form. That's not to say they don't pay attention to what came before, but there's no attempt to repeat the movements on the other side, and/or no attempt to end the form in the same spot you started. What about your forms? Do they strive for symmetry? Do they end where they start? Do you like symmetry or asymmetry in forms?