One evening in early 1950, the film mogul Louis B. Mayer hosted a small dinner party for the actress Gloria Swanson. She was fifty-one years old, which was not considered an ancient, crone-like age, even in an industry that values youth above all else. Still, she was in need of a professional boost. Mayer’s small soiree was something of a ceremonial gesture. Here was one of the last tycoons of classic Hollywood extending his hand and his hospitality to an actress who was tottering, on marabou-covered heels, back into the business after a decade-long fermata.

“Art museums are in a state of crisis.” The diagnosis is drastic, the remedy equally so: a radical update of both form and function. Hopelessly out of touch with the pulse of contemporary culture and the rhythms of everyday life, the grandiose architecture of the museum must be rethought in terms of adaptability and flexibility, with inert galleries transformed into sites of ongoing experimentation. Likewise the visitor’s experience, still rooted in antiquated models of passive contemplation, must be reimagined as a process of active participation and immersive engagement. Museums must reinvent themselves wholesale, in other words, to “guarantee their survival

“Praise the world to the Angel, not what’s unsayable.” Thus spoke Rainer Maria Rilke, waxing a bit Nietzschean. It’s something of a commonplace in late modernity: the exaltation of the finite and transient—“things that live on departure,” Rilke says—and the concomitant demotion or denial of the eternal. The opposition grounds Keats’s “Ode on a Grecian Urn.” Wallace Stevens pares it down to an epigram: “Death is the mother of beauty.”

The gold- and silver-colored crucifix that hung opposite my childhood bed was only one of many that adorned the walls of my home, my school, and, of course, the church I attended. On early-summer mornings the bright, filigreed metal caught the rays that leaked around a too-narrow window shade and the dying Christ glowed as if electrified. At age eight I understood the principle of reflected light but didn’t yet grasp the concept of an afterimage—the result of photoreceptors retaining an impression after the eye is closed or upon looking away from the object. After waking one morning, I allowed