A new exhibition has opened at the Dulwich Picture Gallery which is ground-breaking: it doesn't focus on one artist, and in the past this would mostly have been a dead white male artist, but on a theme. There is such scope here! What about woman doing housework? Women looking after children? The kitchen? The shop-keeper? Oh there are dozens of pictures which have been painted but never gathered in a group. First up in this clearly marvellous exhibition (we have not yet been but my goodness we shall be going) is a photograph: Woman Reading Possession Order 1997 by Tom Hunter, normally in the V & A.