Critics lucky enough to get a sneak preview last year of Siena: the rise of painting 1300-1350 hailed it as the must-see exhibition of the season. They weren’t wrong, but they were guilty of understatement. The show is a once-in-a-lifetime masterpiece. It transfers from The Metropolitan Museum in New York to The National Gallery in London at the end of January. Anyone who loves painting and who missed it in Manhattan might, if circumstances permit, want to consider booking a flight and an entrance ticket now. It is sure to sell out, and rightly so.

The exhibition featured a range of objects, including sculpture, textiles, manuscripts and liturgical artifacts, but it is the paintings that steal the show. Paintings of sublime and timeless beauty, paintings of extraordinary sophistication that anticipate what was to come in the Renaissance. The focus is on Martini, the Lorenzetti brothers, and especially on the brilliant Duccio di Buoninsegna, whose Maesta altarpiece is the star exhibit. Many of the individual paintings that originally made up the Maesta were dispersed over the centuries, and what makes this a unique exhibition is seeing many of them brought together again. It is no exaggeration to say this may never happen again once the show ends in London.

The show is also a triumph of exhibition design and the Met’s staff deserve congratulations for finding such creative ways to see these precious and fragile masterpieces up close and in some cases from 360 degrees. The designers in London have a high bar to reach!