Photographers capture London, city of union flags – the week in art

Exhibition of the week Another London: International Photographers Capture City Life, 1930-1980 Who could fail to be charmed by this exhibition ? Here is London as seen by some of the great photographers of the 20th century, including Henri Cartier-Bresson and Martine Franck. You could say this is where tourists get their revenge. Visitors to the capital see it through different eyes from locals. London's self-image nowadays is as a sophisticated cultural cosmopolis, yet through the lenses of European photographic masters it is the city of pearly kings and union flags – which, this Jubilee year, looks rather accurate. • Tate Britain, London SW1, from 27 July to 16 September Other exhibitions this week Tino Sehgal Interactive art from Berlin is the latest fun in Tate Modern's Turbine Hall. • Tate Modern , London SE1, from 24 July to 28 October Francis Upritchard Ingenious and bizarre sculpture by this New Zealand-born, London-based artist. • Nottingham Contemporary , NG1 from 21 July until 30 September Julian Stair Cutting-edge ceramics with a funereal theme. • Mima , Sunderland TS1, until 11 November Nancy Holt Photoworks by this American pioneer of site-specific art. • Haunch of Venison, London W1, until 25 August Masterpiece of the week Poussin, The Triumph of Pan Revellers spin and gyre round a red-faced herm , the statue coming to monstrous life as wine flushes its cheeks. A Roman vase is rendered immaculately in gold and white on the ground. The classical work lives on in this remote countryside. Pan haunts the glade. • National Gallery, London WC2 Image of the week What we learned this week What Ferris Bueller, art labyrinths and a history of techno music have in common What Tate Modern director Chris Dercon really thinks about BP sponsorship, Damien Hirst and the Belgian avant garde scene How two art-deal chancers tried to flog a Matisse in Miami That there's been a huge, perhaps unwarranted crackdown on London graffiti artists in the run-up to the Olympics Sarah Lucas has landed in Leeds with a new show that could recast the whole language of sculpture All about our long history of attempting to be superhuman... and what the earliest ever artificial arm (from the 1500s!) looks like Ai Weiwei's tax evasion appeal has been rejected by Chinese court And finally … Remember you can share your images on the Guardian Art and Design Flickr page Or share your art And check out our Tumblr Follow us on Twitter Might you be the marketing manager the Photographers' Gallery are looking for?