But a piece of deathless architecture? No. Just a piece of good architecture, which looks a bit cheap and slightly under-detailed but does not disgrace itself. In contrast, the obsessively over-detailed Millennium Wing at the National Gallery suffers somewhat from rough-and-ready construction - this kind of architecture demands perfection of its builders, and does not get it - but has a quality of internal circulation spaces which knocks the socks off the Ussher Library. But then, apart from the temporary exhibitions gallery upstairs, there is very little in the Millennium Wing apart from circulation and ancillary spaces, while the Ussher Library has to pack in the shelves and desks.