It's a Chemicals reaction

The Beck's Fusions project, which took over Trafalgar Square last night, promised to unite music with visual art. They picked the perfect headliners in dance duo the Chemical Brothers, musicians in severe need of something large and sparkly to distract spectators from the lack of goings-on onstage

Dressed in jeans and black T-shirts for their biggest London show ever in front of 9,000 competition winners, Tom Rowlands and Ed Simons huddled behind banks of esoteric equipment and let the huge screen behind them do the work.
Victims of the age-old problem for dance producers who want to perform live - how to look busy once you've pressed play - the non-stop synchronised videos provided more than enough diversion. Material was specially created by Adam Smith, who has directed episodes of Channel 4's Skins and videos for the Streets and Jamie T as Flat Nose George. United Visual Artists, creators of tour lightshows for Massive Attack and U2, took over for the hit-packed encore.