David Zwirner’s gallery at 34 East 69th Street offers an intimate setting for an exhibition of the artist Fred Sandback, on view through May 21. Featuring works spanning the entirety of Sandback’s career and representative of his minimalist visual vocabulary, visitors at the gallery will find that the space in which the work exists is just as important as the art itself. Though Sandback’s work is to be considered sculpture, it has been crafted (using materials like steel rods, acrylic yarn, and elastic cords, typically) resembles a likeness to that of a three-dimensional line drawing, installed in a manner that prompts the viewer to ponder the use of space, negative space, and the way these barely-there figures interact so dramatically with the gallery’s five-story structure.