Art is different from other majors. Every college likes to flaunt its own style, so teachers are willing to cultivate it themselves. There are only two situations of cross-college employment: excellent talents have become famous at home and abroad, and flags are everywhere; Either the college is too bad and there is no one at all. You can't recruit students without relying on experts from other schools to keep up appearances. Of course, it does not rule out that job seekers are too hard and no one dares to refuse.
Most university teachers take the path of walking to graduate school or postgraduate entrance examination, staying in school after graduation or examination, and staying in school after doctoral graduation. Of course, during their study, these people often participate in some large and small exhibitions at home and abroad and win some impressive awards. In this case, if the business is excellent, staying in school is a professional teacher. If the business is not good (climb up by other means), you can also manage the administration and teach some anodyne subjects by the way.