There is a really fascinating exhibition currently on display at the National Gallery in London:Painters' Paintings: from Freud to Van Dyck. The seed for this show was apparently the donation to the National Gallery of Lucien Freud's Italian Woman by way of the Acceptance-in-Lieu programme after Freud's death. Its arrival prompted the Gallery to investigate how many artworks in its possession had belonged to artists down the ages.  The result of this inventory is this wonderful, interesting exhibition.