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It is a chilly morning in spring, around the year 3,000 BC, on a plain in southern England.

A herd of aurochs cattle, each one the height of an adult man, grazes on fresh green shoots.

Keeping their distance from the huge, horned beasts, a family dressed in animal skins walks in procession across the plain.

Their dogs bound through the dewy grass.

Their goat tugs on its rope.

A young child rides on her father's shoulders.

Their leader is a grandmother who shields her eyes against the bright sun.

Her clan live in the vast forest that blankets the land,

and to them this wide-open space is unusual and startling.

But she can make out their destination on the horizon,

a strange white curve on the land, encircling

a group of tall, upright posts, like trees without branches or leaves.

One of her dogs pricks its ears, alerted by voices on the wind.

The other one barks.

...