As many of you know, I practice the Ch'ang H'on tul set, and I don't know any of the others. For those who practice more than one pattern/form set, what do you see as the primary difference(s) (if any) between the Ch'ang H'on tuls and the others you know? I'm asking this more from a philosophical than physical perspective - are the concepts that underlie the forms similar? Different? How so?