The Map That Changed the World

In the summer of 1815 an extraordinary hand-painted map was published in London. Some eight feet tall and six feet wide, brightly coloured - in sea-blue, green, bright yellow, orange, umber - it presented England and Wales in a beguiling and unfamiliar mixture of lines and patches and stippled shapes. It was the product of one man's obsession with rocks, a passion that sustained him whilst the rest of his life slid into ruin.