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A BUILDING implies solidity and permanence, but the history of shelters embraces structures that are impermanent or flimsy. In Houses in Motion (Academy Editions, pp 144, £22.5O pbk), Robert Kronenburg reaches back into the prehistoric to examine the traditional portable structures from tepis to caravans, and into the present for Pink Floyd’s Division Bell tour structure (left), on the way looking at textiles blowing in the wind and emergency shelters. Even more ephemeral is the work of building-wrappers Christo and Jeanne-Claude who planned to wrap the Reichstag in Berlin last week. Their work is catalogued in an eponymous book (Benedikt Taschen, pp 96, £5.99 pbk).