When the Shard opened earlier this month, large crowds gathered across and around London Bridge to watch colourful laser beams shoot out from the skyscraper onto other city landmarks. Now, by tweeting about the Olympics, you can help decide which colours will illuminate the London Eye every night during the Games. An algorithm has been created to track all positive and negative tweets and will convert the results into a lightshow. The Eye’s wheel is also set to sparkle in gold, silver or bronze, depending on which medals Team GB have brought home that day.