Turbine Hall commissions at Tate Modern

Chinese artist Ai Weiwei will be the 11th person to fill London's cavernous Turbine Hall. An influential figure known for his unconventional approach to art, he begins work at Tate Modern this autumn. In the meantime, why not remind yourself of the commissions that have gone before – the spider, the sun, the helter-skelter ... and of course that crack in the floor.

photo © The Guardian