GMAT Reading Comprehension (RC) | Re: The impressionist painters expressly disavowed any interest

"The Impressionists, on the other hand, viewed light, not matter, as the ultimate visual reality. The philosopher Taine expressed the Impressionist view of things when he said, “The chief ‘person’ in a picture is the light in which everything is bathed.”

Difficult to argue this isn't a unifying element. It's light...