“I saw that the camera could be a weapon against poverty, against racism, against all sorts of social wrongs,” Gordon Parks once recalled. “I knew at that point I had to have a camera.” Parks is just one of the renowned photographers featured in this group exhibition, a virtual display that includes Richard Avedon, Irving Penn, Robert Frank, Peter Hujar, William Eggleston, and many more, all of whom had to have a camera. Their visual “notes on America”—images that catch the country from myriad perspectives—are accompanied by inventive videos. Thoughtfully done. —E.C.