The German capital is getting ready to commemorate 25 years since the fall of the Berlin Wall by dividing the city again – this time with a glowing border made of thousands of illuminated balloons.

The installation features 8,000 illuminated helium balloons on poles. They trace the route of a 15km stretch of the Berlin Wall.

Berliners are starting to get a sense of the scale of the project as the balloons are installed on the line of poles snaking around the city.

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People look at balloons placed along the route of the Berlin Wall at Mauerpark (Wall Park). The Lichtgrenze (Border of Light) installation features 8,000 luminous white balloons dividing the city to commemorate the 25th anniversary of the fall of the Berlin WallReuters
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A man walks past a row of balloons along the Spree river near the Reichstag buildingAFP
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The Fernsehturm, or TV Tower on Alexanderplatz in East Berlin, is seen behind a row of balloonsAFP
Berlin Wall fall 25th Anniversary
Artist's impression of what the balloons will look like once they have been illuminatedberlin.de

Organisers say they hope the "Lichtgrenze" – literally "Light Border" – will help people who never saw the wall to envisage what the divided city was like.

The installation is the brainchild of brothers Marc and Christoper Bauder. They said they deliberately chose materials which would contrast with the original wall.

"The wall was a huge construction, monstrous, big, long, high, heavy, made of tough material. We would like to set something against that, something that still makes clear its dimensions, its architectural magnitude in the city, but which consists of very light material – air, light – and ultimately floats loosely and gently, so that the whole thing lets the scar heal again, as it were," said Christopher.

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People walk under balloons installed along East Side Gallery, a remaining section of the Berlin WallReuters
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A man rests against a remaining section of the Berlin Wall at East Side GalleryReuters
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People walk under stands with balloons placed along the former Berlin Wall at East Side GalleryReuters
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Stands with balloons are placed along the route of the former Berlin Wall in front of the Reichstag buildingReuters
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A man walks under balloons placed along the Spree river, where the Wall once stoodReuters
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A tourist boat passes balloons placed along the former Berlin Wall by the Spree riverReuters
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Balloons are seen in front of the Brandenburg GateReuters

The balloons will be illuminated from 5pm on Friday November 7 until 7pm on Sunday. On November 9, the anniversary of the fall, the balloons are to be released into the sky to an accompaniment of Beethoven's Ode to Joy, the official anthem of the European Union.

Berlin Wall fall: 25th Anniversary
Eight thousand illuminated white balloons will trace the route of the wall that divided the cityberlin.de