LONDON, ENGLAND - JANUARY 29:  A woman admires an art installation by Brigitte Kowanz entitled 'Light Steps' which features in the Hayward Gallery's exhibition 'Light Show' on January 29, 2013 in London, England. 'Light Show' features 25 illuminated installations and sculptures by major international artists from the 1960s to the present day. The show opens to the general public on January 30, 2013 and runs until April 28, 2013.  (Photo by Oli Scarff/Getty Images)
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