scale

That was a good example. Loved that red ball project. But its only for the people wearing green t-shirts. we are just spectators watching a circus.
You are right, it is not easy to create A spontaneous meeting point atleast in a short duration of its implementation. But try to consider this example of a small habitat. the pattern is so limited that you end up meeting people you know or meet new people at places like the postoffice, newpaper stands, tea stalls etc. if you blow up the scale to a city, the cultures are diverse and the same meeting places spread out or become fragmented and commercial. Its a challenge to recreate and age an intervention to such a spread out scale. religion, race, class become motives to gather and show support against force. The motive is not interaction. Interaction is a possible outcome.
It would be ideal to make a space where we whipe out the colors on us and amplify/engage voices between just two users. Like Olafur Eliassons installation in MOMA 'room for one color' One sees everything in shades of yellow and black.