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'Colour by Numbers' at Stockholm’s Telefonplan Tower - Kungsgatan 57A, Stockholm, Sweden

Many cities use colour-changing lights on buildings to celebrate events, but Stockholm has a permanent installation called “Colour by Numbers.” The light installation is on the Telefonplan Tower and what makes it different is that anyone with a smartphone can change the colours themselves with a special app. The creators of the light installation hope their work will show the power of democracy, but it is also a cool idea to let residents and visitors have fun with the app.