This is how we played Tetris on the side of the Shell building in the centre of London with a few hu‘’ filmed at the Royal Institution of Great Britain and due to air on TV this Christmas. The ambitious live demonstration, which transformed the building into a playable Tetris-style game, part of the renowned CHRISTMAS LECTURES tradition since 1825, revealed how viewers can change the world from their very own home by taking control of the devices and everyday objects we use every day. The demo was the finale of the first 2014 lecture. When Joseph Swan demonstrated the first working light bulb in 1878 he could never have dreamed that in 2014 we’d be surrounded by super-bright LED screens and lights that could be controlled using mobile phones. In this lecture, Danielle explains how these technologies work and show how they can be adapted to help you realise your own light bulb moments. She shows you how to send wireless messages using a barbeque, control a firework display with your laptop and use a torch to browse the internet. The lecture was broadcast on BBC Four on December 29 Thumbnail image: Newscast For the curious, the code used to to programme the building can be found here - http://bit.ly/1xaRtKN Subscribe for regular science videos: http://bit.ly/RiSubscRibe The Ri is on Twitter: http://twitter.com/ri_science and Facebook: http://www.facebook.com/royalinstitution and Tumblr: http://ri-science.tumblr.com/ Our editorial policy: http://www.rigb.org/home/editorial-policy Subscribe for the latest science videos: http://bit.ly/RiNewsletter