Louis Kahn (1901–74) was an architect who designed buildings that looked like castles; this was true whether they were small Philadelphia villas or vast institutions such as his parliamentary complex in Dhaka. His style – which he arrived at only in his fifties – is characterised by what look like thick fortified walls of massive masonry pierced by simple geometrical shapes and sometimes topped with turrets, as if they have been designed by a necromancer or numerologist in the 13th or 14th century. The architectural historian Vincent Scully, an admirer, thought these buildings an intimation of divinity, and much writing about Kahn is overblown: ‘inventive power’, ‘personal discovery’, ‘fundamental geometry’ – that sort of thing.