The world’s greatest art fair is underway in the Dutch town of Maastricht. This is the place for Old Master paintings. “About two-thirds of the world’s currently available supply of Dutch and Flemish Old Masters are for sale under a single roof, an irresistible magnet for collectors from all over the world.” But this year the fair is trying to widen its horizons, and a record number of dealers of 20th Century art are on hand. – The Telegraph (UK)