Tate seed art shut due to health concerns

Visitors to Tate Modern have been banned from walking on more than 100 million porcelain "sunflower seeds" that an artist is exhibiting.

The seeds were created by Chinese artist Ai Weiwei to fill the central London gallery's turbine hall.

When it opened on 11 October he urged guests to stomp on the seeds and roll in them.

But concern has now been raised over "dust" being created and people must now look at the work from above.

Will Gompertz reports.