
By the 1950s, plastic had been invented and clear plastic raincoats became a fashion trend. Many illustrators were drawn to the challenge of capturing light reflecting on this new, translucent material:



It's not always easy to tell from the way Rockwell's work has been reproduced in cheap magazines. But compare this printed cover for the Saturday Evening Post:
with the big, glowing original painting hanging on the wall at the Rockwell museum:
His description of the girl's plastic raincoat is a tour de force:
Notice the attention he paid to the rim on the lid of the paint can, or the bottle of medium, or the scuffed shoe:
Similarly, there is nothing formulaic about Rockwell's treatment of the wooden box. Those lines are not straight because Rockwell understood and cared about how the box had been treated on its voyage through the material world. Here is intense, honest observation:
For another example, in the corner of Rockwell's painting of a pharmacist...
... you can see that he didn't neglect the bottles, the test tube, the spoon. Importantly, these obsessive details are not described with photographic realism, as Rockwell's thousands of clueless imitators would surely have painted them. They are expressed through the loving eyes of someone with rapturous appreciation for their physical qualities...
There have been other great materialists in art before Rockwell. Vermeer and the golden age Dutch painters delighted in the properties of fine material objects: the textures and patterns of lovely fabrics and tapestries, the sheen of metals, the soft feel of furs.
Renaissance art was also a period of great materialists. Freed from the medieval focus on the supernatural (and spurred on by the invention of soap) Renaissance painters obsessed over the surfaces of the secular world-- the nuances of human flesh and the reflections of armor.
Norman Rockwell was a true materialist in that tradition and, in my view, can walk proudly in that company.