In Betty Nunes’s dining room, with its flax-colored walls and sunflower-patterned curtains, two motifs dominate. One is the Holstein cow, depicted in small figurines and black-and-white artwork showcasing the breed’s distinctive spotted markings. The other is a collection of sweeping aerial photographs of her family’s 866-acre dairy farm, perched at the far edge of the Point Reyes peninsula.
“I always thought it looked like a village,” said Betty, 86, gazing fondly at an image…