A US Navy Department of ship poster entitled 'Why Help Gremlins?' depicts two vingettes; the first, labelled 'Square Corners and Gremlins Play,' features a gremlin as it uses a crowbar to widen a crack in a corner, and the second, labelled 'Round Corners, They Stay Away,' shows an oblivious gremlin as it walks along, May 1, 1944. During World War II, a concerted campaign was made to reduce cracks in the metal of ships during contruction; rounding corners was one solution. The mischevious gremlin was a concept popularized by British author Roald Dahl in his children's book 'The Gremilins,' about mythical creatures who damaged airplane parts, which was adapted for a film by Walt Disney; though it was not made, the gremlin depicted here is very similar to early production sketches. (Photo by Hulton Archive/Getty Images)
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