In one photo, ice floes separate like shattered glass — a world of blue and white, cracking apart. The photo beside it looks almost like a scene from another planet: a marsh overflowing with water, rivulets of deep blue between bright patches of green.

These aerial photos were taken by the New Orleans-based photographer Tina Freeman, many miles apart: the ice, off the eastern coast of Greenland and the marsh, near Delacroix, La. But Ms. Freeman paired them as a diptych, part of her exhibition “Lamentations,” on display at the New Orleans Museum of Art through early March .

Side by side, the structures in the two photographs are strikingly similar. The ice and the marsh shapes look almost like inverses of each other, a negative and positive of the same photograph. Both environments in these photos are unhealthy, and breaking apart, though you might not be able to tell from one glance. The ice is moving south, cracking off a glacier, melting; the marsh is rotting and breaking up, starved of organic matter, turning into open water.