The phrase "art magnet" refers to a person or place that attracts or is strongly associated with art and creativity. It suggests that the person or place has a strong pull or influence in the art world.
Art magnets let your kids personalize their gift making them extra special to give and receive. (web.kidsactivitiesblog.com)
Merideth Hillbrand, who graduated from a public arts magnet school in San Francisco after her Oxbow semester, also describes contrast in the two schools» approaches to teaching art. (edutopia.org)