The wall, that is the prototype of the Occupy Central, of this one. Same, same idea. Basically, this then completely eliminates rumour on that street, so the other streets set up the same projection screen. Then the occupiers inside saw it was such a good idea that they also set up two screens showing each street. The walls now become transparent. It’s as if the police are not there. It’s as if people can just talk to each other through those mutually transparent walls.