They’re not exactly light summer fare, but Alex Van Gelder’s photos of gravestone, mausoleum and family tomb portraits are a visually stunning showcase of the effects of aging on pictures. Cracked and deteriorated, images like this untitled portrait are no longer about solemn memorials; now they demonstrate the aesthetic effects of disintegration, as if the hand of time wielded Photoshop for its own pleasure. (On view at Cheim & Read through Sept 8th.)