Contributed by Elizabeth Scheer / As the city transitions into solstitial warmth, two stand-out exhibitions reward the corresponding sense of emergence. Helen Frankenthaler’s “Drawing within Nature: Paintings from the 1990s,” on view at Gagosian, and Trevor Shimizu’s “Cycles” at 47 Canal are preoccupied with what the American poet Wallace Stevens described in his poem “Notes Toward a Supreme Fiction” as the discovery of “order as of a season.” Both exhibitions feature pastoral scenes that impressionistically use color, texture, and line to reveal patterns in the apparent arbitrariness of the natural elements they aim to represent.