Who painted the plastic foam dominoes that marked the anniversary of the fall of the Berlin wall?

The 2.3-metre-high blocks, painted by schoolchildren, stretch for 1.5 kilometres in a path near the Brandenburg Gate and the German parliament.Who painted the plastic foam dominoes that marked the anniversary of the fall of the Berlin wall?
I heard they were painted by various people in various countries around the world.Who painted the plastic foam dominoes that marked the anniversary of the fall of the Berlin wall?
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