Companion exhibits are an effective way to display the scope of an artist’s work and take the pressure off the central show’s focus to be all-encompassing. Even a comprehensive retrospective can’t fully illustrate all aspects of an artist’s creative life. Think back a couple of years ago when San Francisco’s Museum of Modern Art held the Wayne Thiebaud retrospective and the Crocker Art Museum simultaneously held an exhibit of his drawings. A similar event is taking place now. While the Crocker is hosting a strong exhibit of paintings by Hung Liu, Midtown gallery b. sakata garo is also showing Liu’s works on paper. What sets this show apart from other companion shows is the quality. Liu proves to be a master printmaker; all the skill and effort that go into the paintings are equally strong in the works on paper. But you don’t have much time. Liu’s Works on Paper is only up for a couple of more days. The gallery is located at 923 20th Street and is open Tuesday through Saturday from noon to 6 p.m.