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“All Is Flux” is particularly abstract and fluid-looking, an inky black and pearly white photogram depicting a stream of water flowing across still water in a tray.

She also collected dust and dirt swept up while at home for almost three months under covid restrictions, printing one pile of debris each day as a near-abstract photogram.

His final piece, “Performing Light,” presented at the Richard Saltoun gallery in London in 2019, is represented by a black-and-white “photogram” of his own frail body that ends the show.

An 1841 photogram of a fallen leaf, its dozens of needles each seared into the paper, testifies to Talbot’s ambition to document nature better than any artist.

Sotheby’s was encouraged by the online sale of a rare photogram by László Moholy-Nagy for $524,000 and of Irma Stern’s oil on canvas “Grape Packer” for $531,309.