Residents in Lublin and Vilnius can see each other in real time.
The sci-fi-like portals were designed to connect and unify people in different parts of the world amid the months of isolation caused by the pandemic, and the increasing "social polarization" of recent times.The devices look like circular doors into another world, as imagined in many fictional worlds of fantasy and sci-fi. In fact, the team behind the project said it chose the circle as it is a well-known sci-fi symbol for an interactive "bridge." The minimalist design with LED lighting, meanwhile, was chosen to portray the image of a future city.
Via Interesting Engineering, where there is a promotional video. A longer report at Bored Panda indicates that other portals are being planned, including at Reykjavik and London. I think a pair in Florida and Minnesota would help promote travel between the two, as residents take turns winter/summer wishing they were in the other state.