Art Chicago is an orgy of fast art. Scores of galleries haul out scads of work so visitors can plow up and down endless aisles burdened with art regressing toward the mean. The work, mostly by living artists, is mostly a blur. Occasionally something lends a booth enough gravity to slow you down, more often than not modernist paintings that you’ll never see in a museum since they’re privately owned (and not necessarily museum-quality pieces even if they’re museum-quality artists). This year the highlights for me were Chicago Imagist pieces of relatively recent vintage – works by Karl Wirsum, Gladys Nillson, Ed Paschke, Roger Brown and others across a smattering of local galleries.