Ooohh edgy artists, don't you just love 'em! Staff at the Tate Modern are handing out leaflets advising customers of the dangers in getting too close to the new installation in the Turbine Hall, Shibboleth by Doris salcedo. This piece of work starts as a hairline crack in the concrete floor and widens to a few inches and a depth of about three feet. So far three visitors have fallen into the gap, happily none of the injuries were serious. Staff are said to have advised Victoria Beckham not to visit in the interests of her own safety.