The Tholos is a technology torn from the pages of old pulp SciFi: cylindrical pillars of two-way video screens which allow people in different cities to meet and talk in realtime, for free:
"People standing in front of London's Tholos would see a wrap-around picture of the scene in Vienna. At the same time, a similar London image is displayed in the Austrian capital.
"Citizens in both countries would be able to face each other and talk via an array of directional microphones and loudspeakers, which keep conversations private.
Effectively, it is like meeting up in the town square - except that you might be on different continents."
The Tholos' creators plan to have pillars in sixteen cities by the year 2008.
(from Smart Mobs)