"Being an island is something strong,” says the artist Zilia Sánchez, a singular, if long overlooked talent. “It’s not about being self-centered. The things I want to do, I want to do them by myself.” The 93-year-old’s first museum retrospective, “Soy Isla” (or “I Am an Island”), on view through this month at El Museo del Barrio in Manhattan , explores island life both literal and figurative. Born in Cuba, Sánchez lived for a time in New York City, then moved to Puerto Rico in 1971. Despite wide acclaim there, she was in her late 80s before the international art world began to notice her undulating three-dimensional canvases, which she shapes over wooden armatures to suggest the female form, otherworldly landscapes and the shifting sea. Sánchez lost much of her work when Hurricane Maria ripped the roof off her San Juan studio in 2017, but she rebuilt and continues to work every day, compelled, she says, by a stronger inner force. “That’s how the art is. It is in my soul. I have to go to the studio.”