The classic video game Tetris is played on the 29-story Cira Centre in Philadelphia on April 5, 2014, using hundreds of LED lights embedded in its glass facade.
Hundreds of Tetris fans are having a little fun with a big version of the classic video game.
The Philadelphia skyscraper-sized version created a spectacle on Saturday that organizers hope inspired onlookers and players to think about the possibilities of technology.
The 29-story Cira Centre, which has hundreds of LED lights embedded in its glass facade, provided a 100,000-square-foot "screen" for the gamers. Images of supersized shapes "fell" on two sides of the tower as competitors used joysticks to manoeuvre them into place.
The marvel kicked off a citywide series of events called Philly Tech Week. It also celebrates the upcoming 30th anniversary of Tetris, a game loved for its elegance and simplicity.