At TEDxWaterloo in Ontario, Canada -- which took place on March 3rd, 2011 -- attendees found themselves face-to-face with a “Tower of Tweets." 

Five Christie MicroTiles --  world-famous digital projection screens -- were stacked atop one another to form a column in the venue’s lobby.  Taking this technology, Patrick Dinnen of Media Lab Toronto designed a custom Twitter wall that pulled and displayed all tweets with the #TEDxWaterloo hashtag tweeted during the event. He wanted to create an easy way to view virtual conversations in the real world:

Here's a short video of Dinnen's "Tower of Tweets" in action.

For more information on TEDxWaterloo, visit their website, Facebook page and follow them on Twitter.