Fiat lux! Let there be light! Our art critic Sean Rose takes us to see two exhibitions full of luminous dynamism. First to the Palais de Tokyo where the Paris' contemporary art center stages a major retrospective of Argentine-born artist Julio Le Parc. A well-deserved solo exhibition for a great figure of contemporary art who in the '60s was part of an avant-garde group standing against the ego-inflated gesture in art.