I see that a precedent for the 'visionary' Millennium Dome can be found not just in 1951 (Ralph Tubbs) but in 1851. The Panorama (Zone Books, £29.95) includes this section through James Wyld's 'Great Globe', which stood for 11 years in Leicester Square. Stars were painted on its outside wall; on the inside, the earth's surface with all its continents and oceans was reproduced in relief. 'It is one of the most pleasantly instructive sites in the Metropolis, ' said a contemporary travel guide. I wonder if Mr Mandelson's 'experience' will reap such plaudits.