Carsten Nicolai and
Olaf Bender’s light/sound installation
White Line Light at Strachan Avenue Old Police Station from Toronto’s 2007
Nuit Blanche is still one of my best NB experiences. (Sad that it's been all going downhill now year after year.) Sorry I couldn't find a good clip of the Toronto installation online. Here's a later iteration in the Hague:
Video from mediateletipos's Vimeo channel