Roland Bernier, who worked in abstraction and text-based conceptualism and had been showing his work at many of Denver's top commercial galleries and museums since the 1980s, died last summer. But it was his involvement in the alternative art world as a longtime member of the Spark Gallery co-operative that explains why members there overwhelmingly voted to mount a show to honor his memory. The group gave over all three spaces to The Seen and Unseen: Roland Bernier, an economical survey of his incredible output that was curated by members Sue Simon, Elaine Ricklin and Madeleine Dodge. Among the earlier works were an elegant '80s abstract and a sophisticated pattern painting based on graffiti from the '90s. The show was dominated, however, by his 21st-century pieces, wherein Bernier used words as his principal compositional device. In some, words were spelled out in 3-D letters, while others employed words appropriated from photocopied newsprint. This memorial exhibit only hinted at Bernier's tremendous range, because Spark isn't big enough to accommodate even a single sample of every kind of thing that he did.