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Sub-Lieutenant Alan Hogarth of the Royal Navy walking on the River Thames at Tower Bridge on polystyrene shoes which he constructed himself, London, UK, 18th May 1971. (Photo by D. Morrison/Daily Express/Getty Images)

Sub-Lieutenant Alan Hogarth of the Royal Navy walking on the River Thames at Tower Bridge on polystyrene shoes which he constructed himself, London, UK, 18th May 1971.  (Photo by D. Morrison/Daily Express/Getty Images)