It was certainly one of the crowd favourites at last weekend'sNuit Blanche 2008 in Toronto. Enthusiastic crowds gathered at City Hall and used their cell phones to play classic arcade games like Pong on the building's facades.

Time-lapse video bysyncros.

There's good news for those who didn't have a chance to see the awesome interactive light display.Stereoscopeby German artistsBlinkenlightswill continue to blink away tonight, until 7am on Sunday morning.

To play games on City Hall's East tower, participants need to call:
Invaders: 647-259-8560
Mole: 647-259-8543
Breakout: 647-259-8563

To play games on City Hall's West tower, participants will have to call:
Tetris: 647-258-1674
Pong: 647-259-8559
Snake: 647-259-8557

Photo: "encounter at city hall" byBarbara Stumm.