The structures in the Bechers’ original photographs are almost identical, though in Khan’s hands the images’ contrast and opacity is adjusted to ensure each layer can be seen and has presence. Though Khan works in mechanised media and his images are of industrial subjects, their effect is of a soft ethereal energy. They exude a transfixing spiritual quality in their densely compacted details and ghostly outlines. …Prison Type Gasholders conveys a sense of time depicted in motion, as if transporting the old building, in its obsolete black and white format, into the extreme future.