A Hayward Gallery employee poses for photographers inside artist Anthony McCall's installation entitled 'You and I, Horizontal' at the gallery in London, Tuesday, Jan. 29, 2013. The exhibition 'Light Show' featuring 25 illuminated installations and sculptures by artists from the 1960's to the present, will run from Jan. 30, 2013 to April 28, 2013. (AP Photo/Lefteris Pitarakis), APTOPIX