It’s 11am in Dublin and about 30 people on North Earl Street are vigorously waving at a man on an escooter in New York, who stares back at them with a look on his face that suggests he’s not entirely sure what’s going on.

The two cities have just been linked up via a 24-hour live stream as part of the Portals art project. The large circular screen in the middle of the north Dublin street provides a window to the Flatiron South Public Plaza at Broadway (and vice versa) and will remain in place until the autumn.