'Bedlam!' The very name conjures up graphic images of naked patients chained among filthy straw, or parading untended wards deluded that they are Napoleon or Jesus Christ. We owe this image of madness to William Hogarth, who, in plate eight of his 1735 Rake's Progress series, depicts the anti-hero in Bedlam, the latest addition to a freak show providing entertainment for Londoners between trips to the Tower Zoo, puppet shows and public executions.