After scrolling through nearly 1,400 images of paintings and photos of people knitting on Google Arts and Culture, Ms. Kern found only two who were Black. Since then, Ms. Kern, 28, has started a ...

As the co-author of “People Kissing” and “People Knitting,” Levine combs flea markets, giveaway piles and eBay for old photos of anonymous people, which she curates into themed collections.