The days when the integrity of artists’ content was jealously protected by art museums has long gone. To think that there was once a time when simply putting type over an art work could cause an upheaval. Now it’s open slather. Sometimes the artists are into it and sometimes they just have to suck it up. Whether René Magritte is beaming or sucking is anyone's guess but the Magritte app from Tate (Magritte it) is certainly another step in the journey. Now you can make men in bowler hats cascade in front of any image you choose. There is also an animated version. We chose the face of Tate Director Nicholas Serota just in case René is after some payback.