Last updated at 22:43 01 July 2007

A floor of chequered tiles stretches down a long, high-ceilinged corridor with doors leading off each side.

And the art of crop circles reaches a new height of sophistication.

The astonishing three-dimensional design, 200ft in diameter, has been created in a wheat field at Silbury Hill, Wiltshire.

Only yards away are the 5,000-year-old West Kennet Longbarrow burial grounds, one of the largest and most impressive Neolithic graves in Britain.

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According to folklore, the mound is traditionally visited at sunrise on Midsummer's Day by a white figure accompanied by a white hound with red ears.

It has been the setting for several crop circles in the past, including an elaborate 350ft pattern featuring a giant Egyptian mosaic in the shape of two wings, surrounded by symbols which bear a striking resemblance to the Mayan calendar which predicted that the world will end in 2012.

The latest design was photographed by Steve Alexander, who with his wife Karen, a writer, has been researching crop circles for more than 15 years.

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Mrs Alexander-said: "It's one of the most architectural designs we have seen, rather than purely geometric.

"In traditional geometry a square represents material reality and a circle represents the divine or heavenly realm.

"A lot of people are saying this circle represents the passageway through the physical world to the divine world."