I thought I knew Damien Hirst. The one who puts dead animals in formaldehyde. Made a skull of diamonds. Did some things with coloured dots. Made me think: "Modern art? Rubbish. Anyone could do that." Well, turns out I was wrong. The current Tate Modern retrospective has changed my mind - and made me something of a fan in the process.
The beginning of the last century, on the surface of things, was a time of pomp and ceremony; of military parades, imperial regalia, flag waving and staid order. Yet far from being symbols of stability, these represented a growing unease felt by ruling elites in a world where the existing order of things was being undermined.