Residents of the rival cities of Toronto and Montreal are being told it's OK to have a fling with the other city - or at least that's the message in this campaign by Toronto Tourism. It has erected The Cheating Wall, huge video screens which form a 'live interactive portal 'to the other city, at high profile outdoor locations. Passers-by can see, talk and interact with people in the other city in real time.

The wall consists of separate HD video panels, each with their own camera, microphone, sensor and speaker allowing people to have live chats with someone individually in the other city. There's also a Facebook page where visitors can win flights to the respective cities courtesy of Air Canada, and people are being encouraged to tweet about the wall.