Exhibition of the week Ed Ruscha The master of cool irony and urban surrealism gets a mini-retrospective courtesy of the Artist Rooms collection. • Modern One, Edinburgh, from 29 April Also showing Richard Long The open spaces of an 18th-century estate, with deer herd, are perfect for Long’s contemplative works. • Houghton Hall, Norfolk, until 26th October Syria: A Conflict Explored Photographs by Sergey Ponomarev, and a display examining the politics of the most tragic conflict of our time, bring this excellent museum’s history of warfare disturbingly up to date. • Imperial War Museum, London, until 3 September William Mackrell Surrealism is reborn in this artist’s provocative photographic and sculptural works. • The Ryder, London, until 27th May Russian Revolution Lenin’s application for a reading pass to the British Library is among the exhibits in an archival history of the event that shook the modern world. • British Library, London, until 29 August Masterpiece of the week |