Kellie Shaw (R) inspects one of Leonardo

Melbourne, AUSTRALIA: Kellie Shaw (R) inspects one of Leonardo da Vinci's most famous designs which is recognised as the ancestor to the modern helicopter and is part of an exhibition featuring 50 models of 15th century inventions by Da Vinci, in Melbourne 04 July 2006. This craft is made of linen, reeds and iron thread and would have been operated by four men rotating a shaft. The exhibition focuses on four themes: mechanical, military, hydraulic and flying machines with each model built according to Da Vinci's drawing and are crafted from materials available in 15th century Italy. AFP PHOTO/William WEST (Photo credit should read WILLIAM WEST/AFP via Getty Images)