You could romanticize it as a balcony, but really it’s an ornate fire escape, painted creamy beige and stretched across the facade of the Walter Kerr Theater. And if you’d glanced up from West 48th Street early one evening this month, you’d have spied a tableau of considerable glamour and grace: André De Shields, in citrus-striped coat and zebra-striped shoes, posing for the camera with the animate aplomb of a model who just happens to be a dancer.