The device allows people in the cities to see – and interact with – one another in real time.

The device allows people in the cities to see – and interact with – one another in real time.
The measures were due to go into effect at the start of the new school year next week.
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Under-18s are banned from leaving the home alone and pedestrians must remain 2m apart.
The opposition warns that the changes could invalidate elections.
A new poll echoes previous ones showing PiS’s judicial reforms having more opponents than supporters.
Church services are also limited to five people and public transport will be restricted.
Three new polls show a big majority in favour of postponement.
Authorities in the Lazio region claim the masks were seized by Polish customs.
The accused priest was moved from parish to parish by the Archbishop of Gdańsk without explanation.
Daniel Tilles
Holding elections would risk both public health and the health of democracy.
Poland has introduced some of the toughest measures in Europe, and polls suggest the public approves.
Returning Poles must enter quarantine; restaurants, pubs & cafes closed.
The speaker has faced criticism for taking a skiing holiday in Italy in the midst of the crisis.
Universities are also shutting down, but the Catholic church has called for more masses to be held.