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Celmins’ 1968 drawings of old black-and-white photographs torn from history books — a 1930s zeppelin airship, Hiroshima’s nearly obliterated 1945 landscape — begin with a sheet of paper prepared with a ground of snow-white acrylic.

Above them was a suspended zeppelin: Imagine a giant balloon of a baked potato floating over 34th Street in the Macy’s Thanksgiving Day Parade.

In groundbreaking work published last year, the Harvard team deduced that the stellar halo is tilted and elliptical in shape, like a zeppelin or football.

And Harper asks viewers to hurt themselves suspending their disbelief, most notably in an action sequence where Rachel jumps out of a plane and lands on a zeppelin called The Locker.

In Scotland it became useful as a reconnaissance plane to protect the Forth coastline and Rosyth dockyard against German zeppelins.