Paintings done with stripes, bars, lines and planes is what you’ll find at Rule Modern and Contemporary Gallery on most days. Director Robin Rule fills the rooms with a mix of minimalist old masters from New York, like Carl Andre and Mary Obering, and local talents, such as Clark Richert, the dean of geometric painting. From time to time, she also shows quirky abstracts, representational works and photos. But there’s no denying that less is best at Rule.