Art is a window on the world. Well, in the case of Daniel Buren’s Borrowing and Multiplying the Landscape, installed for the opening of Turner Contemporary in Margate last year, it is. Buren’s installation modifies the view of the sea beyond the windows of the gallery foyer by covering much of the glass with coloured tape so that the sea is seen through a circular window cut into the yellow stripes. In a sense the work forms an inverse sun framing, on my visit at least, the greyness of and English summer afternoon. Ah well.