The very popular Light Show at London's Hayward Gallery is definitely the most entertaining show I've seen so far this year. It explored the experiential and phenomenal aspects of light through sculptures and installations from the 1960s to the present day.
Time stood still in Olafur Eliasson's show-stopping Model For A Timeless Garden:
Drawing of François Morellet's light sculpture Lamentable made up of eight dislocated arcs of a circle hanging down from the ceiling:
Light Show reminds me of Björn Dahlem's room-sized light sculpture The Milky Way from a couple years ago. Drawing of Dahlem's installation from the exhibition The Shape Of Things To Come at Saatchi Gallery, London 2011: