Though she was gravely ill this past winter, Robin Rule, who earlier in the year had closed her bricks-and-mortar gallery in RiNo, was still determined, after decades in the art business here, to remain a part of it. Together with Adam Gildar, she co-curated Dimension and Symmetry: Clark Richert at the Gildar Gallery. It was a handsome solo given over to one of her closest friends and one of the most loyal artists in her former stable. Poignantly, the show was still up when Rule died, in December, and remained up for many weeks after. It proved that though life is short, art is long, and Rule's contributions are lasting ones.