The Penthouse at Go Studios on 39th St. in Manhattan is set up for photo shoots 'n stuff, such as rooftop tryouts of Leica cameras. Like the inner shell of a cracked egg, one studio provides a wonderfully open white space with clear luminosity. Lights, camera, makeup, then photo action for a patiently sitting henna-haired model chewing gum. The product will be glamorous and deceiving. Shadows will be gone, gum will be removed, pulchritudinous perfection will pervade.