The large exhibition rooms at Robischon Gallery allow co-directors Jim Robischon and Jennifer Doran to mount large solos that are linked thematically. That was the case with these four shows, each of which examined the politics of the landscape. Chuck Forsman: Markers featured the famous Boulder artist's iconic paintings of the environment under siege. Next were the digital photo-based images of Elena Dorfman: Empire Falling. These montages depicted scenes that the California-based photographer encountered in a tour of abandoned quarries. Beyond was David Sharpe: Waterthread, which comprised a breathtaking array of large-format pinhole photos in color by local photographer Sharpe. And finally, there was Isabelle Hayeur: Flow, a video projection by a Canadian artist that depicts a landscape morphing from bucolic to industrial. One of Robischon's strong points is presenting programming that functions separately but works well together.