Last September, she asked Zosia Mamet to imitate the poses she had collected; the photographer Gus Powell shot. on page M2118 of the NewYork edition with the headline: Act Natural. For those who are unfamiliar with the concept of a “lift chair,” it’s essentially a remote-controlled recliner that will actually lift and tilt forward, allowing an elderly person to gradually rise and be able to stand. My grandmother had one…