It takes a lot of work to make a show look as unconsidered and chaotic as this one: thought and care and time and attention all have to be paid before something so random can be achieved. But as so often with Tillmans, the nagging questions persist: is randomness, are the offhand and the casual, valid as ends in themselves? Because Tillman’s über-hip affectless cool has become very tiresome indeed. Even worse, it’s becoming predictable and dull. Tillman's eye, as ever, remains wonderful, but I remain doubtful about the form in which he chooses to convey his ideas.

Lift music is given a conceptual twist by former Turner Prize-winning artist Martin Creed this week. As part of the Southbank’s Chorus! festival, Creed has recreated his Work No. 409 especially for the Royal Festival Hall’s glass lift: as visitors go up and down the six-level lift, their ascent and descent will be charted by the rising or falling pitch of professional choristers Voicelab.

Goldsmiths has produced 20 Turner Prize winners. It produced Damien Hirst and the majority of the Brit Art pack that caused such a Nineties sensation. It has attracted some pretty impressive tutors to its fine art department – ground-breaking artists in their own right, in fact. As such, the school is considered to be something of a star in itself. So what’s its secret? This BBC Four two-parter aimed to find out - and, you’ve guessed it, in keeping with a certain jaunty documentary-making tradition, it gave the participants just enough rope to hang themselves.

Billy Childish claims to think only in pictures. But since writing forms as big a part of his creative output as painting, that can’t be quite true. In fact, he’s written a number of autobiographical novels as well as collections of poetry. What’s more, he’s a hugely prolific musician, so I’m sure he means only that he feels a little more comfortable expressing himself through imagery rather than abstract concepts – though obviously, being human, he must do that as well.

Dazzling and surprising, this Tate Britain retrospective by the 1998 Turner Prizewinner Chris Ofili should erase memories of the media sniping about him making money from using the so-called "gimmick" of incorporating elephant turds in his paintings. It will also confirm his status as one of the greatest contemporary British artists.

"Depeche Mode," says Jeremy Deller, "have always been seen as a bit naff in this country, at least in the media. They could never shake off the image of their earliest Top Of The Pops appearances, so no matter how musically exploratory they got, they tended to be seen as this jumped-up rather silly pop band.