In a series of interviews in her sparsely but artfully furnished apartment, Ms. Herrera always offered an afternoon cocktail  “Oh, don’t be abstemious!”  and an outpouring of stories about prerevolutionary Cuba, postwar Paris and the many artists she has known, from Wifredo Lam to Yves Klein to Barnett Newman.

Image Ms. Herrera’s “Red Star” from 1949. Credit... Collection of Estrellita Brodsky, First Sale

“Ah, Wifredo,” she said, referring to Lam, the Cuban-born French painter. “All the girls were crazy about him. When we were in Havana, my phone would begin ringing: ‘Is Wifredo in town?’ I mean, come on, I wasn’t his social secretary.”

But Ms. Herrera is less expansive about her own art, discussing it with a minimalism redolent of the work. “Paintings speak for themselves,” she said. Geometry and color have been the head and the heart of her work, she added, describing a lifelong quest to pare down her paintings to their essence, like visual haiku.

Asked how she would describe to a student a painting like “Blanco y Verde” (1966)  a canvas of white interrupted by an inverted green triangle  she said, “I wouldn’t have a student.” To a sweet, inquiring child, then? “I’d give him some candy so he’d rot his teeth.”

When pressed about what looks to some like a sensual female shape in the painting, she said: “Look, to me it was white, beautiful white, and then the white was shrieking for the green, and the little triangle created a force field. People see very sexy things  dirty minds!  but to me sex is sex, and triangles are triangles.”

Born in 1915 in Havana, where her father was the founding editor of the daily newspaper El Mundo, and her mother a reporter, Ms. Herrera took art lessons as a child, attended finishing school in Paris and embarked on a Cuban university degree in architecture. In 1939, midway through her studies, she married Mr. Loewenthal and moved to New York. (They had no children.)