In Gradation (2011), nine raspberries lined up on a lichen-dotted rock progress from left to right, dark to light, plump and juicy to not-yet-ripe. Through a curatorial act of collection and arrangement, Campbell alchemizes discrete instances of color, fabricating a gradient. Viewed alone, each berry would be unremarkable. But when placed in Campbell’s ordered context, interesting details emerge. The slightest variations in color and scale become suddenly perceptible.