Doris Salcedo, Caravaggio and Jacob Zuma exposed – the week in art

Exhibition of the week: Doris Salcedo You can still see the traces of it if you look down at the concrete floor of Tate Modern's Turbine Hall. An apocalyptic rift, separating landmasses, pushing the building, the world, apart ... The crack in the floor of this vast space that Doris Salcedo created in 2007 was one of the most powerful artistic interventions in the Turbine Hall. Now here she is with more of her eerie manipulations of familiar places and ordinary things. Salcedo is Colombian and, like her compatriot Gabriel García Márquez , sees reality through magical eyes. Only, with her the magic always seems secretive, sinister, violent. A crack in the world. Salcedo is an unsettling, outstanding artist of our time. • White Cube, Masons Yard, London, until 30 June Other exhibitions this week Facing the Music Portraits of contemporary British composers. • Barber Institute of Fine Arts, Birmingham until 28 August Tom Phillips New works from the creator of A Humument . • Flowers, London, until 7 July Masterpieces from Mount Stuart Paintings from the Bute Collection, including Dutch Golden Age delights by de Hooch, Cuyp, and van der Neer. • Scottish National Gallery, Edinburgh, until 2 December Robert Holyhead Watercolour drawings and paintings in his first solo show at a public gallery. • Peer, London, until 7 July Masterpiece of the week Caravaggio , The Supper at Emmaus The genius of Caravaggio for painting still life glistens in the food on the table as the risen Christ reveals himself at a humble repast. Extremely lifelike details – a shell, a chicken – and a radical foreshortening of outstretched arms make this painting intrude into our world. It is as alive as life. • National Gallery, London Image of the week Jacob Zuma, the South African president, is going to court to argue that a painting that depicted him with an exposed penis should be banned . Zuma's governing African National Congress (ANC) is bringing a legal action against the Goodman Gallery in Johannesburg over the work, entitled The Spear, by artist Brett Murray. The painting was defaced by two men earlier this week and subsequently removed from the gallery. What we learned this week How great your street photography is How a War Room and a phallic wooden screw are shedding new light on 1960s spirit That the Tokyo Skytree became a record breaker Why we should be more worried about the future of Italian art than parmesan production The logistics of moving some of Britain's most gigantic sculptures into a tiny gallery Lastly Have you seen the Guardian Art and Design Flickr page? Share all your latest cultural snaps there You can also share all of your artworks with us Or follow us on Twitter Like us on Facebook Check us out on Tumblr Sign up for the Art Weekly newsletter