Adam Elsheimer is one of the unsung heroes in the history of European art. His small but exquisite paintings on copper have an unmistakable richness of detail and invention. Elsheimer, unjustifiably little known today, was recognised in his own time as a genius. He transformed every genre he touched - narrative, landscape and the depiction of interiors - and he played a crucial part in the formation of Rubens and Rembrandt.