In 2018, during a nine-month stay in Patagonia, the Dutch photographer Pie Aerts often spotted puesteros from a distance: lone figures atop horses, silhouetted against the horizon. “In that huge landscape, they appeared stoic, but extremely vulnerable, as well,” Aerts told me recently. Those distant encounters were the whole of his contact with the men during that trip; it wasn’t until the compulsory lockdown of 2020, which Aerts endured back home, in Amsterdam, that he began to consider the effects of prolonged isolation. Recalling his visions of puesteros, he searched for more information online and came across a short documentary that chronicled their seclusion. He reached out to the film’s director, Matías Bolla, an Australian filmmaker of Chilean descent who was also spending quarantine in his home country. The exchange led the pair back to Chile in 2022, on the first of several trips that have resulted in a feature-length film, currently in post-production, and the photo book “Coirón” (GOST Books), which takes its title from an unusually resilient grass that is native to the region.