A man takes a wooden block from "the Disappearing Wall" at the Grand Place, Brussels, Belgium, Oct. 3, 2020. The art installation "the Disappearing Wall" was set up to mark the 30th anniversary of the German reunification. It consists of 6,000 wooden blocks with quotes of worldwide artists and thinkers. After passers-by take away the wooden blocks with quotes, the installation will be left with an translucent frame, showing the concept "the wall will disappear". (Xinhua/Zheng Huansong)

People take the wooden blocks from "the Disappearing Wall" at the Grand Place, Brussels, Belgium, Oct. 3, 2020. The art installation "the Disappearing Wall" was set up to mark the 30th anniversary of the German reunification. It consists of 6,000 wooden blocks with quotes of worldwide artists and thinkers. After passers-by take away the wooden blocks with quotes, the installation will be left with an translucent frame, showing the concept "the wall will disappear". (Xinhua/Zheng Huansong)

People take the wooden blocks from "the Disappearing Wall" at the Grand Place, Brussels, Belgium, Oct. 3, 2020. The art installation "the Disappearing Wall" was set up to mark the 30th anniversary of the German reunification. It consists of 6,000 wooden blocks with quotes of worldwide artists and thinkers. After passers-by take away the wooden blocks with quotes, the installation will be left with an translucent frame, showing the concept "the wall will disappear". (Xinhua/Zheng Huansong)

People take the wooden blocks from "the Disappearing Wall" at the Grand Place, Brussels, Belgium, Oct. 3, 2020. The art installation "the Disappearing Wall" was set up to mark the 30th anniversary of the German reunification. It consists of 6,000 wooden blocks with quotes of worldwide artists and thinkers. After passers-by take away the wooden blocks with quotes, the installation will be left with an translucent frame, showing the concept "the wall will disappear". (Xinhua/Zheng Huansong)

People take the wooden blocks from "the Disappearing Wall" at the Grand Place, Brussels, Belgium, Oct. 3, 2020. The art installation "the Disappearing Wall" was set up to mark the 30th anniversary of the German reunification. It consists of 6,000 wooden blocks with quotes of worldwide artists and thinkers. After passers-by take away the wooden blocks with quotes, the installation will be left with an translucent frame, showing the concept "the wall will disappear". (Xinhua/Zheng Huansong)

A man takes a wooden block from "the Disappearing Wall" at the Grand Place, Brussels, Belgium, Oct. 3, 2020. The art installation "the Disappearing Wall" was set up to mark the 30th anniversary of the German reunification. It consists of 6,000 wooden blocks with quotes of worldwide artists and thinkers. After passers-by take away the wooden blocks with quotes, the installation will be left with an translucent frame, showing the concept "the wall will disappear". (Xinhua/Zheng Huansong)