In Gradation, nine raspberries lined up on a lichen-dotted rock progress from left to right, dark to light, plump to unripe. Through this curatorial act of collection and arrangement, Campbell alchemizes discrete instances of color into a single phenomenon, fabricating a gradient out of found pieces. Viewed alone, each berry would be unremarkable. But when placed in Campbell’s ordered context, keen details emerge: the slightest variations in color and scale suddenly become perceptible.