Long before they got their nicknames, the historic neighborhoods of LoDo and RiNo were defined by the railroads that brought commerce to Denver. That heritage creates the perfect conceptual tie-in for Joseph Riché's "Trade Deficit," a three-part sculpture spread near Broadway between Blake and Lawrence streets, with the most successful portion on Blake. For all three, Riché used discarded freight containers painted different colors to create constructivist piles that simultaneously refer to the area's past as a hub of transportation and to its present — and future — as an art center.