In the galleries: Finding, and creating, nature in the city

The artists of "Nature in the Walkable City" may not all have architectural training, but the District Architecture Center show does emphasize precise rendering. Whether depicting flowers or buildings, animals or statues, the 14 participants favor crisp accuracy over looser or more subjective modes. The closest thing to an abstraction here is Kappy Porsch's realistic close-up, executed in watercolor and color pencil, of a sycamore tree's patterned bark.